I am a sophomore in the Department of Physics. I often meet my classmates who don’t understand thermal management and ask me if there is any good online course recommendation. I said reading books is fine. Is the thermal management of Kardar, Wang Zhuxi, and Ma Benkun not enough? They said that they couldn’t stand it, and it was better to attend the class. I wonder, can you learn physics just by listening to class? Don’t you need to read more to get a sense of it? Uri!

The feedback they gave me is that I can’t stop reading a book. My advice to them is to meditate hhh. Sometimes I feel that listening to online classes is also a kind of “laziness”. I used to rely on online courses for a while, but I didn’t want to find a good book to read. Now I feel that reading a book quietly can really digest knowledge. It is a completely different feeling from listening to a class. Reading a book gives me a feeling of “chewing slowly”, I like it!

My personal experience, online classes are more guiding and enlightening, but they are by no means all of the learning. On the contrary, we should go one step further, read books and digest, chew up knowledge, and turn it into our own. On this basis, we will find excellent courses to be inspired!

I am still very worried that many physics students in Chinese universities do not like to read good books and good textbooks!

It is not clear about the current learning status of the students. Only share some personal experiences. Listening to lectures and reading books are all part of learning. There are two other activities when I study by myself: 1) Go to the library to check related books and literature. Because in the books I read, there are many references in the footnotes (such as Peng Huanwu, “Theoretical Physics Fundamentals”; Wang Zhuxi, “Thermodynamics (Second Edition)”; Han Degang, Gao Zhidi, Gao Panliang, “Physical Chemistry”). 2) Get this exercise set and do it. This is what I learned from my classmates in Jiangsu Province in my freshman semester after my freshman year. When I was in college, the college entrance examination rules in Jiangsu Province changed almost every two years. Students had no reference to previous years of experience and could only practice basic skills diligently. My classmates taught me that to learn to understand, I still have to do exercises. Later, I saw Dick Feynman said that learning physics without doing problems is equivalent to wanting to give birth to children by communicating and making pen pals. I feel the same. I saw someone mention Yang Zhenning. He once recalled his experience of listening to “differential geometry” when he was studying at Southwest Associated University. He said that what the professor said was not good, so he should follow the textbook; he just took the exercises 1, 3, and 5 on the homework book. , 6 also did. Therefore, there is a contradiction in listening to the lectures, that is, you choose interesting courses, and there is no guarantee that the professors who teach will also make you interested. I communicated at Shandong University back then. I felt that I had come to the center of mathematics. I hurried to listen to “functional analysis”. As a result, the professor was about to give birth to children. He couldn’t be tired. The voice was very small. I used a small piece of paper to make an outline to derive the theorems in the book, and I didn’t play much. I can’t hold on after listening to a lesson. Later, when I listened to “Engineering functional analysis” at Southeast University in Sipailou, Nanjing, the professor spoke interestingly. It was also very interesting to listen to colleagues talk about real variable functions in 2019. Therefore, the quality of this lecture varies from person to person and is not uniform. Another example is that I listened to the “Physical Chemistry” of Shandong University. I thought that they would have more class hours, which would be more in-depth and thorough than the “Physical Chemistry” of my alma mater, Tianjin University. The result was disappointing. What’s new. The extra time is used for students to give lectures on topics of interest to them. If you want to understand some things, you still need to learn by yourself. But listening to lectures is not the same as listening to lectures. I did not do well in the first semester of “Physical Chemistry”. Later, the roommate in the same dormitory took part in a re-study class for the evening lecture due to the suspension of subjects. He said that the lecture was an old professor who was re-employed after retirement. In the end, my roommate in the department scored more than 80 points, which was more than a dozen points higher than my one-time use, which made me very embarrassed. Interesting lessons are very interesting. Listening to the “polymer physics” by Teacher Zhang Jie of Shandong University, not only can I learn some knowledge, but also listen to her daily life of the university’s green peppers, and get a glimpse of the suffering and happiness of intellectuals, which is a different kind of enjoyment. After listening to the class, I can still think about life. It is really “one piece worth five pieces”. In the same way, if you listen to Feng Dacheng’s lecture on “quantum chemistry”, you can listen to him for five hours of continuous lectures, and you will be more and more energetic and appreciate the style of a generation of scholars. The same is true for teacher Xiong Shijie of Nanjing University. His doctoral dissertation is the first batch of outstanding doctoral dissertations in China. It is available in the school history museum. Dozens of PPTs of his “computational physics” can be taught for a semester, and there are many paragraphs in class. I am amused myself first in the lecture. Not to mention the “Advanced Quantum Phase Acoustics” of Teacher Li Jun. And Liu Zonghua from East China Normal University talked about “Quantum Statistical Physics”. The beginning of the chapter was about the real number field, which gave me a taste of “Hilbert Hotel.” All of the above cannot be felt when reading textbooks. Although some professors continue this style into their writings, it is inevitable that they will not be missed. Even the public class is not good. Teacher Li Jun faces the camera, and the dirty mouth in his mouth can’t be played out. After all, the ten fingers are not uniform. In a university, there are always excellent courses, and water courses are always inevitable. Back then, the “Structural Chemistry” of Tianjin University and Shandong University were all based on the script. I didn’t learn anything. Now I don’t have any impression of the above two courses. It is estimated that one of the valuable qualities that need to be cultivated in universities is that they can still pass the exam even if the teacher is at an average level. But as far as my personal habits are concerned, when I come into contact with a completely unfamiliar topic, I still look for public lectures or handouts. Because textbooks tend to have a lot of content, and they don’t know which books are better in unfamiliar fields. If you want to appreciate its core knowledge, the lecture content of the course is small, so it is easier to get the whole picture. For example, I recently paid attention to the related technologies of Alpha Fold. Among them, I don’t have some knowledge of bioinformatics. In addition to looking for some books in the library, I also found the open class of Bioinformatics at Peking University on station B. I read some of the content and learned about Multi-Sequence Alignment. Here I also recommend it to readers who have passed by. The course is divided into multiple sections, each section is only about ten minutes, very suitable for getting started. I recalled the pros and cons of attending classes, let’s talk about reading. Both Chinese and foreign textbooks have the kind of “books that have been turned into lectures”, with dry content and little use. In particular, some books do not even write about the logical relationship of knowledge, and the books become scattered pearls, or technical manuals, which will make readers very troublesome to read. At this time, I used to go to the library and look for other books to see if there was a detailed explanation. But opening many books at the same time will greatly slow down the speed. Although I have always advocated “to go through a book first, and to have a general understanding of the knowledge described in the book”, looking back on my 20 years of schooling, I find that I have never read only a book. . The book selection here is also very important. I generally read according to the books quoted in the articles I read, but I don’t rule out stepping on pits. David Chandler’s “Modern Introduction to Statistical Mechanics” is a book cited by everyone in the circle, and it is very difficult for me to read it. Later, I read Pathria and then came back to read this book, and I felt a sense of “sudden realization”. The bottom line is that Chandler’s book applied a lot of knowledge of density matrices, but did not spend time on density matrices! In addition, some of his explanations were copied directly from T. Hill’s book, but he did not copy all of them. But I have this skill, is it not good to just read Pathria? It is better to read Kerson Huang’s book again than to get stuck on this book. I still regret struggling with this book for a long time when I was young and had time. So it is not easy to understand with a thin book. For the same reason, there is a “Statistical Field Theory” that is very thin… there are more pits in reading literature, so filtering the essence from a large amount of text is also a basic skill. Finally, remind young people: Did Einstein take online courses? Did Einstein come up with the theory of relativity because he got an A in the “Theory of Relativity” course? Did Einstein come up with “Relativity” exercises and put forward the Theory of Relativity? I think the establishment of scientific literacy and taste is a more important task during college than studying a few courses. In fact, Einstein was denounced as “a lazy dog” by his mathematics teacher Minkowski because he didn’t listen well in class. And because of lack of relevant mathematics, Einstein had to come back and relearn mathematics with Minkowski and his former classmates in the process of studying the theory of relativity. But everyone knows that Einstein’s five papers in 1905 laid the foundation for several disciplines. The Nobel Prize work of Yang Zhenning and Li Zhengdao back then was the biggest physical effort, which was to put together all the experimental results including parity and check them one by one. These are all “hands-on skills” outside of textbooks, that is, put forward an idea, and then design a set of methods to test your own ideas. I recently had a phase change job. I felt that a method I used during my Ph.D. period would definitely be able to simulate the phase change of molecular crystals. I asked students to do it. It really is. There is also an important ability to continue thinking about problems. As long as you search, you will find that Max Planck conducted long-term research on black body radiation from 1894 to 1900 and published many papers. As far as 1900 when he put forward the light quantum hypothesis, he had two papers discussing this topic. Attendance can only understand the greatest common divisor of the course. To truly gain something, you need to continue studying during the holidays. This is the learning method that I learned after consulting with the teacher after class when I was in my sophomore year. Share it with everyone here. Another advantage of lectures is that you can report the cutting-edge developments involved in this course at any time. After all, the timeliness of a book is limited. Here is a section of “Computational Physics (Graduate)” I taught to give everyone a taste.


By zhiwo

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6 months ago

1. You are also a sophomore, you should also try to weigh efficiency and benefits when considering problems. I have always supported the self-study stage to start with the open class. Don’t I know that reading can produce more details ? I also know that you can get more from writing a textbook by yourself. Isn’t this more calm and digesting knowledge? So in the future to learn a subject, start by compiling a textbook first? Since there is everything in the literature, Why do undergraduates need professors to give lectures? Why do postgraduates need tutors to guide? I don’t know if your understanding ability is beyond ordinary people, but at least you can’t come to a conclusion now, because the four major mechanics of undergraduate level and below The subjects are really not that difficult. If you look at the textbook, it is normal to see it in, and it is normal to not look at it. However, most people will occasionally fail to read QFT or introduce some technical methods in the future. It feels like, at this moment, you are hard on the stuck place. In theory, you can get through this hurdle after all, but how much time and energy will you waste like this? Believe it or not, I say if you get stuck in the place Just skip over, look back, and try to go through the main line of the full text first. Then go back and look at the remaining problems in front, you will solve faster. Because at this time you already have an overall perception of the theoretical framework Now, the dead end of thinking that many novices fall into is no longer stuck. The final conclusion is that if you take these two paths to learn the same height, the latter will take much less time than the former, and it will take you at the same time. The energy will also be less than the former, and in the end, if there is no mental illness [1], the latter experience will generally be better. You may even fall into this scene when you walk the first way: open the book, read it On the one hand, on the second side, I don’t understand a certain formula, ah, stare at this formula, the more you stare, the more sleepy you are, and then you think, “Since I remember what this formula looks like, it’s okay to close my eyes and think.” Then you woke up, and you were very upset about your behavior. The next day, you even repeated the first day… the last holiday without seeing the fart, just blaming yourself and sleeping on the desk. But If you take the second path and decide to read through the book first and then read the book carefully, then what if you change the operation of reading through to watch a series of public lecture videos? In fact, it will be easier and less tangled, because always Someone is helping you advance the topic, you don’t have to read it yourself, just listen. It’s lazy, isn’t it? But why don’t you just let it go, and you must choose a more inefficient and energy-consuming approach? Isn’t it? Is the easier way better? Is it somehow touching to use a more painful way to achieve the same effect? ​​In fact, you can generally come into contact with many points of view that do not coincide with the current teaching materials in public classes. It is inevitable, because a complex course has countless ways of teaching, and more exposure to some perspectives will allow you to learn from Look at this three-dimensional subject from more angles. So for learning important subjects, I always recommend that you follow this step: Choose an open class that is more compatible with yourself. Choose a textbook that is more compatible with yourself (if you let Recommending to you by seniors will be more efficient than finding it yourself). Read the open class first, and then start to read the textbook. If you will have this class next semester, you don’t even need to force yourself to do after-school exercises[2]. If the class starts, listen to the teacher carefully, compare your previous self-study content, see if there are any similarities and differences, and discuss with the professor. Write the homework carefully, and at least the teacher’s assignment can be solved completely without doubt . Independent of the framework and even notation of the classroom and textbook, compile a course-related note according to your own logic and taste. The efficiency of this operation is relatively high, but I don’t understand the four major mechanics in the preparation of a school year The extreme situation [3] where the status of the computer has soared to the level that QFT can roughly calculate is not applicable. In that case, watching the video may actually waste time instead of reading the textbook directly, but it must not be smashed or chewed all the way. Slowly, the pursuit of efficiency is to read through many times and deepen your understanding of the overall situation. For example, don’t think about collecting all of the eyes in the first week. We will pass the level first, and then collect all the eyes in the second week. It will be much more comfortable. You have to say you are I like to collect all kinds of things in one week, and I can only say that when you start scientific research in the future, there are some places where you can die. You are just learning from the exquisite theoretical models carefully organized and summarized by others, I How do you feel that nature should be efficient. Are you afraid of spoilers when you study? 2. Don’t abuse yourself, be nice to yourself, fishing is an oasis on the king’s journey. I don’t know if you have ever played the kind that needs to weigh the time of study and love. Gal, a specific heroine may need your grades to reach a certain level to be able to attack, but your energy will drop very quickly when you study all the options, and finally you will end up in a dead end, so you must choose entertainment and relax appropriately to restore your energy to reach a level. Subtle balance. In fact, when it gets bigger, almost all business games require players to find a subtle balance in order to pass the level. In a numerical world, this is the case, but in real life, why don’t you realize this? Is it done? Why do you always feel that you can get higher profits by constantly squeezing yourself? Can you really use willpower to achieve 16+ hours a day and concentrate on studying efficiently? Have you ever done it? Persevere How long does it take? Everyone’s situation is different, but how many things you can learn in a day is probably to respect objective laws. You can only concentrate on learning 5 hours a day at most for the first three years. Today, you suddenly changed your previous mistakes and scolded yourself. Pause, and then from then on the effective study time per day will be able to soar to 12 hours? It is impossible, it is impossible for people to concentrate for a long time, this is an objective law, always have to be distracted. There are two different paths here: Force yourself to concentrate, and then start to play on the phone aimlessly, then extremely upset, lock the phone. Then start to scan the web aimlessly, and then extremely upset, go to the library , Then I started to stare in a daze aimlessly, and then I was extremely upset and blamed. After watching for two hours, I felt it was difficult to concentrate. I openly admitted that people need to relax, and I directly opened a few cartoon episodes [4], Shuang Let’s talk about it. After reading it, I feel that I can live for two hours again, and I am happy all day. Anyway, I have to waste some time. Why not do something cooler to restore more energy and adjust your mood by the way? ? When I study, I always think about cartoons and video games. This is normal and I will do the same. Then go play video games, don’t make yourself difficult. In fact, the reverse situation is also very common for me, just watch cartoons. When I go in, I am always thinking about a few mathematics. Then I will go to academics, don’t make yourself difficult. If you have never been in this state, either you haven’t played enough, or you actually don’t like scientific research. No Play enough and continue to play, switch careers if you don’t like it. Entertainment and relaxation are what you deserve, never sins. Anyway, I don’t really believe that those who achieve high accomplishments come out by self-discipline or self-abuse. I always think that the key to doing one thing well is that you want to do it well from the bottom of your heart, and then find an efficient and practical method, instead of madly challenging the limit of your willpower. The first touted. The self-masturbation test of perseverance should really be beaten by me. You are now in your sophomore year, and when your junior year is over, you will find that you always overestimate the time of one day, but underestimate the progress of the year. From what you use The word “laziness” is used to describe online classes, and your mentality is actually not so healthy. Last holiday I brought three books home, and I have worked very hard but only read half of them. I shouldn’t have read this holiday. Bringing three more books full of self-blame, I will respect the objective laws, only take one home, and see how much you count, let me go, I’m just a human being one by one.

6 months ago

Let’s have a brief chat and write wherever you think. I mainly want to talk about a question of knowledge structure. Of course, the online courses and textbooks I will talk about later refer to sufficiently excellent online courses and textbooks. It is better to throw away the textbooks that read other people’s PPT or those textbooks that have been transformed after a bunch of western textbooks have been translated. Regardless of whether it is a course or a textbook, they are essentially a way of recording knowledge (as a kind of data). Textbooks are generally limited by the characteristics of paper materials and can only record information in a linear structure or a tree structure. For some basic physics and mathematics, we have optimized this type of structure for hundreds of years, so the recording efficiency is still relatively high, and you will not have much problem reading directly. But for many more cutting-edge mathematical knowledge, we don’t have enough time to optimize, so many times reading a book will make people feel dizzy, especially easy to lose the ability to grasp the key points of a certain field. For example, quantum field theory. Before Srednicki’s textbook came out, if you gnaw on Peskin or something, you would feel uncomfortable and feel lost. This is why many people will consider listening to some lectures or reports when trying to enter a new field. Because the frontier’s progress is usually not linear or tree-like, it is more like a complex network structure. However, textbooks are limited by the material form and cannot effectively record the information of the network structure. At this time, some good courses or reports can freely present the knowledge network of the entire field. In addition, these courses or reports have a unique advantage in that some insignificant details can be omitted. This is not allowed in concentrating or essays. So if you often gnaw on textbooks, it is easy to lose a “big picture view”, and this “big picture view” can only be recovered by taking the time to sort it out by yourself, or listening to other people’s organized lessons or reports. To a certain extent, the reason why you feel that the subject of the topic “reads books to digest, chews up knowledge, and turns it into your own, and then looks at excellent courses on this basis, you will feel inspired” is this reason. It is important to realize that the knowledge structure can have a variety of different structures such as linear, tree or network, because this will affect your future construction of your own knowledge system and the use of different human-computer interaction tools to output or Express your own knowledge system. A while ago, there was a big fire in a tool called Roam Research. An important reason is that everyone realized that the knowledge data produced by cutting-edge research has a network structure rather than a linear or tree structure, so a record network knowledge structure Tools become very important. This is why after it came out, tools such as Notion, Obsidian, etc., have quickly launched their respective two-way link features. Of course, I am not planning to write a personal knowledge management tutorial here (although I have been researching this field for a long time, I will see if the data in this answer is good, and then think about whether it is necessary to write a little bit of this content. ). In short, there is no best data structure, only the most suitable data structure.

6 months ago

I think if you want to really learn something, the effective time is probably a certain amount. Whether it is attending classes, listening to online classes or reading books, in the end, I cannot do without a lot of thinking and summarizing myself. However, one thing that can be confirmed is that the limitations of reading are the smallest. The book will tell you the complete logic and the most details, and it is also the most helpful for independent thinking and deep understanding. But at the same time, if you are completely unfamiliar with this field, starting from online courses may not be a bad choice. When I studied Guangxiang and Retong before, I had watched online classes (Liang’s and Kardar’s), but I would find that some things were not clearly stated in the class, and then I would go to study again. Online classes are indeed more “easy” and “efficient”. If your purpose is to deal with the exam, it is understandable that you would rather watch online classes than read books. However, if you want to understand some of the more difficult things, you must read the book. And to read physics books, you must read those large paragraphs of text, because it is very likely that those are nontrivial, it is physics, and many derivations are just logic and skills (not that the derivation is not important, everyone will just know it).

6 months ago

For the study of this course itself, I feel that it is not a particularly serious problem. I can read a book or listen to an online course, whichever I feel more comfortable with. For example, when I was “self-study” in high school (the reason for quotation marks, see below), Retong didn’t read books, and directly listened to the class of Teacher Ma Hongru of Jiaotong University at station b. Later, I turned over Landau Statistical Physics 1, which was just a taste; I bought a copy of Pathria last semester, and left a page untouched. If you want to say how much thermal system I still have, I just remember the density of states, ensemble theory, partition function, Maxwell relation, several distributions and images of phase transitions. If you ask me for specific calculations, you have to turn the book. It’s better to say that I didn’t learn it at all. I just knew that there is such a thing. It can be handled in this way. Give me a simple problem that has been solved. I can calculate it according to the basic routine and check the book. But I can’t rely on one by one. The brain and a pen reconstructed the entire framework of the thermal system, even specific to the details of the deduction, and even put forward his own point of view. But at this stage, I don’t really want to see the heat system. So the reason lies in the extent of the requirements for learning. If you just want to cope with the exam, or the so-called learning of the hot system, listen to the online class. Anyway, as long as you pass the exam, you can forget it after a month. If you want to learn a little bit, listening to the online class is the student’s mentality. You can refer to online classes, but in the end, you have to study yourself. This is a manifestation of initiative, and reading a book is not enough; if you want to be truly proficient and have your own understanding, most people may need to think repeatedly. To deepen your understanding when dealing with practical problems, you can not only get it at hand, you can easily calculate the non-extreme relativity density of state function, degenerate the heat capacity of Fermi gas, but also rise to the philosophy of physics, and have a profound physical image , You can also apply this knowledge appropriately to specific scientific research issues. These are not what you can do by taking an online course and reading a few books. I think it is the result of repeated thinking in the end. And to be honest, there is no uniform method for learning. If you try to construct a set of so-called efficient learning methods to learn professional content, I personally think it is of little use. Interest is the most important thing.

6 months ago

Reading books and listening to online classes are not contradictory, each has its own advantages. The following is my attitude towards reading books and listening to online classes: Not necessarily correct, but I think it is still effective. For a new class, the first step is to listen to the online class first. You don’t need to spend too much time to listen carefully. It may be an hour of jogging on a gym treadmill and listen to a chapter or two at double speed. It may be lying in bed and nothing to do. Can’t sleep, listen to three or four quarters. Don’t ask yourself to master how deep the knowledge points are, and have an overall impression. How to test your own results is to see if you can use your own understanding to tell others about it. The second step is to read a book. Reading a book requires a lot of time, which is different from online classes, which can take advantage of fragmentary time or boring time. Calm down first, hold the pen, and outline what you think is the key or difficult point. Sketch it out, go through a chapter, and sort out the general framework. How to check: You are required to have a general understanding of what each piece of knowledge is used for, and which part is a bit difficult to master. The third step is practice. After the book, or assigned by the teacher, there will always be some types of questions. It’s really not possible, and you can also find relevant knowledge point exercises on the Internet. Looking at the topic, at this time, there are basically a lot of “I have an impression, but I can’t write it.” Turn the book, sketch, record. It doesn’t need to be too many, the four and five questions are roughly the focus of this chapter (engineering, maybe liberal arts, or more in economics). The above mentioned is a kind of subject that has plenty of time and is more important and requires systematic study. The following is not necessarily useful in the future, you only need to mix the subjects of eighty to ninety points. The following methods are full of utilitarianism, and the methods are relatively hard-core, so watch them as you see fit. If you don’t call these classes, try not to waste time. The first step is to look at the exercises and you will not know all of them. At this time, if there are seniors or teaching assistants, then ask them. Look at which knowledge points are used, look at the knowledge points roughly, and summarize how to solve this kind of question routine. At this time, the exercises are not just five or six that can be learned. Do it all and see which place is most important. The second step is to look at the questions of the previous year’s test papers and explain them in detail. Which knowledge points are released every year. Which knowledge point is out once or twice. Which knowledge point is difficult to understand and does not ask questions. For the first two items, focus on conquering, and the third item, skip directly, but the mentality should not be chaotic. For this kind of subjects, using the above methods, usually sign in, do not have to go to class, spend an hour a week to do the questions, spend two or three days before the test, and it is not difficult for the final score to be 90. This example is just to illustrate. Sometimes reading is just a method that is not too efficient, but in some cases it is necessary. These must be judged based on the student’s self-positioning and the importance of the subject to it.

6 months ago

I personally prefer to read books instead of open classes. It may be because my English is too bad and my mind is not fast. I often misunderstand other people in class or sometimes I don’t understand, and no one can ask, so I have to refer to it myself. book. In fact, I learned the lesson and read the book again, which was not very efficient. I don’t know if the impression is deeper, because no matter how you learn, things you don’t use for a long time will be forgotten, and things you use often will be proficient. Maybe your classmates have good brains and good English listening skills. Take a course and find a better public class (it’s great if you can find a public class. If it’s cutting-edge or uncommon, you can only gnaw books and literature. If you listen to it, you will understand it, even if you don’t know how to read through the textbooks, you will understand it. This is indeed more efficient than just flipping books, because the teacher’s one-hour class may take two hours to your own eyes. As for the undergraduate course, it is far from the frontier and the difficulty is relatively low, so there may be no need to read it repeatedly. Just go through it in the simplest and easy way. It is more cost-effective to save time for advanced courses or read articles. Because if you look for a few books in each course and want to “study solidly” in this way, then I tell you, unless you have the ability to concentrate and have amazing self-control, you can take a long time to read these books every day , And maintain a certain reading speed, otherwise you will not see much after four years of undergraduate degree, which is actually not conducive to future development. It is still very difficult to achieve these two points. On the one hand, it is difficult for you to maintain a certain reading speed, because you often need to think and get stuck. On the other hand, people’s attention has a limit. When you lose your attention, you think you’re watching, but you don’t actually see anything. Of course, you may not encounter these problems at all. This can be regarded as a lesson for me personally, but the reason for the lesson may simply be because I am too cooking.

6 months ago

I feel that this question can be answered a little bit from the perspective of the student or the teacher, but I can’t sleep anyway, so let’s talk about it while the phone is still charged. From a student’s point of view, the first thing to explain is that there is no contradiction between listening to online classes and patience to study by yourself. However, if there is a phenomenon that you cannot read the book, one of the main reasons is not because of impetuous mentality, but because the content expressed in the book is beyond the scope of your own comprehension-maybe the author is originally speaking mysteriously, but it is more likely to be I really don’t have that comprehension ability. This ability may be due to text reading comprehension, or it may be due to reasoning and logical deduction. But most people like to self-attribute this phenomenon to impetuousness. After all, it is relatively more difficult to admit that one’s ability level is defective. Compared with reading a book by yourself, online classes have multi-dimensional experiences such as sound, dynamic vision, and interactive commentary on barrage, which weaken the requirements for comprehension to a certain extent. In fact, there are situations in which going to school to listen to lectures (assuming that the teacher performs well, rather than reading the textbook) is better than reading alone. This is essentially the same reason. . Assuming that reading a book can also send a bullet screen to interact with the person who is reading the book, the book review made by each person can be read, and the reader can give feedback to the author in real time, I believe that no one can refuse while studying Reading books… From the teacher’s point of view, the existence of online courses has greatly improved the efficiency of students’ preview and review, and a large number of (free) online course resources have also reduced students’ learning costs. It is indispensable to quietly read books and do questions, but reasonable use of online learning can indeed achieve a multiplier effect with less effort. I personally think that an ideal and efficient teaching mode is online class preview + interactive discussion in class + reading after class and reviewing class videos. In addition, I have also roughly compared the effect of online lessons and normal classes during the epidemic period for students with the same initial level in the same course (undergraduate junior year, non-parametric statistics), and found that the effect of online lessons is actually good… The preliminary guess is that the online course allows playback, re-listening, slow playback after recording, etc., which leads to a more adequate understanding and reaction time for students. Of course, the tension caused by the epidemic is also part…After all, the sample is a group of juniors == In order to avoid the sample being biased, I took a look at other teachers (the older I was about four or five years old and barely peers). In the case of the class, it is found that the online class that can be replayed or the combination of online and offline works better. I have to say that, in my opinion, online classes are indeed the greatest invention of this century, not one of them.

6 months ago

Surprisingly, the same is learning, reading a book is more noble than listening to an online class? What do you mean? In the information age, the channels for learning are already very rich. All roads lead to Rome. Just find the one that suits you. Why should other people worry about it? Knowing that we are now vigorously developing the field of video-live broadcasting and launching the function of converting text to video. I think it is also because of the shortcomings of text reading: boring and easy to persuade. A purely knowledge article of a few thousand words is difficult for many people to read, but it is much easier to accept it in a video format. The patience for watching videos is much longer than the patience for reading text. Even if you watch online classes, you can accept something back and forth. What’s more, a good online class can stimulate your interest in learning; reading books requires full investment, especially complex and difficult books. Even so, you may be struggling and don’t force yourself. Can’t continue. Any discrimination is to show one’s superiority. I admit that people who have self-control to gnaw books have certain advantages, but they cannot belittle the learning methods of others to show their superiority. For most students, the curriculum has an irreplaceable role and necessity as a textbook. Textbooks are equally important. I never thought that anyone would give a hand to these two brothers. Watching online classes does not mean abandoning books, but using them together. Whatever is effective for learning is not to say that I think online classes are better than reading books, so I will definitely not stick to online classes. This is to adhere to prejudice, not to adhere to principles, and it will cause rigid thinking. It is no different from the demons of the key political circle.

6 months ago

Some books in science and engineering are not suitable for self-study. Take the electronic information engineering book “Signals and Systems” as an example. Most people don’t know what the Fourier Transform is for after they have studied it, so they can only do the questions. There are also formula derivations in the books.
Listening to the online class can help you get started in self-study, and the teacher will make it clear what it is. In the examination, you can list the formulas for you, and just write the question types directly.

6 months ago


There are worries, but we also need to know the role and significance of online classes. Take myself as an example. I am relatively dull. When I was in junior high school, I had a small technique for solving binary linear equations, the cross multiplication method. Most people mastered it after the teacher said it once. Finally, I found the handouts and online courses on the Internet to fully grasp it. For example, the trigonometric functions in high school are similar. Some people can learn without listening to the lecture, and some people can’t understand it after listening to the lecture. That’s the truth. Most people may be in this state of understanding but not understanding. The effect of online courses on us is similar to what you think. It serves as a guide and understanding, but some people’s purpose is not to learn “good” physics or other things. Some theoretical knowledge just wants to get a good grade or pass the exam at the end of the semester, so special guidance and explanation are enough. Any active learning is the result of interest, and everyone is the same, with almost no exceptions. So I think you still have to look at their own purpose for this knowledge. Of course, the above is just my humble opinion, I hope to inspire you from other aspects.

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