I really just want to be a scholar

Chapter 220 I, Qin Ke, am here to accept anyone's questions!

Several comments were posted in the comment area immediately: "You're welcome, Qin Ke, you are doing well, we are all watching the live broadcast to support you, come on!"

But it was Lin Chaowen and the others.

Qin Ke smiled slightly: "Let me just say it again. I came up with this idea on the plane returning from the national competition, and then I asked my fellow professors Shi Cunyuan and Lin Haibo for advice on how to write a paper..."

"To be honest, I don't think this paper is very academic. After all, I only wrote the core argumentation process for two nights..."

"By the way, the student Ning next to me also participated in the writing process of my thesis, because my writing skills are indeed limited, especially the 'scientific style' gave me a headache, she helped to modify a lot of words, It made this paper look much more pleasing to the eye, and then Professor Shi Cunyuan optimized individual words in the paper, and this is the paper you see now."

"As for the process of submitting the manuscript to editor-in-chief Xiao Mao, editor-in-chief Xiao Mao has already mentioned it in his own public letter, so I won't repeat it."

"The reason why I started this live broadcast today is very simple. I just thought that editor-in-chief Xiao is over fifty years old, and he is still under such intensive firepower. After all, I am young, and I have no job to lose, let alone I can be relieved of my position, I am just an ordinary student who likes mathematics, plus I have a thick skin, I am not afraid of ridicule, and I am not afraid of losing face, knowledge and knowledge are all about learning and asking, I have learned, and now I am waiting for you to ask!"

"Now let me briefly explain the rules. Because there are too many comments on the live broadcast, I can't read all of them. Therefore, if you want to communicate with me or ask me academic questions, you can contact me by initiating a 'Lianmai' request. Show your face on the same stage and communicate face to face together.”

"Of course, there may be more requests for 'connection', so the school committee next to me will randomly select one of the requests to connect with each other. Each time there is a limit of one question, I will complete the answer within 3 minutes."

"About the question, because I have only read the textbooks of the four basic subjects of undergraduate mathematics, you can ask any questions about these four subjects within the scope of the undergraduate course. If I fail to start answering within ten seconds, or I If I get it wrong, then I will lose."

As soon as this rule was said, everyone in the live broadcast room and even the small auditorium gasped.

If you fail to start answering within ten seconds, you lose?

Is ten seconds of thinking time enough?

Qin Ke didn't read the comments posted in the comment area anymore, he stood up slowly:

"However, since there are winners and losers, how about adding some trophies? I lost, and I knelt down to admit my mistake. I will stay here and let you mock and slap me in the face until the live broadcast ends!"

"If I win by luck, or if no one can ask me down by the end of the live broadcast, then I only have two requests. First, please don't make any more slander and attacks on editor-in-chief Xiao Mao. His starting point is correct. I I also hope to use facts to prove that I have lived up to his trust, please let him continue to shine in his favorite mathematics career, the mathematics world needs such a forerunner who is serious and courageous to reform!"

"Second, seniors, please show more tolerance, support and encouragement to the young juniors, and less questioning and ridicule, so that the learning atmosphere in the mathematics world will be better!"

"The above, I have finished what I want to say, let's start tonight's academic exchange!"

The students in the second and third classes of high school on the stage were excited, especially when they saw Qin Ke talking eloquently, with a calm and confident expression, and felt admiration. Wu Guangben, the monitor of the class, gave an order: "Class two and three, stand up!"

The whole class stood up and shouted in unison: "Qin Ke, Qin Ke, you are invincible! Brother Ke, we will always support you!"

The shouts of dozens of teenagers and girls echoed in the small auditorium, and they were extraordinarily imposing. The director promptly split the live broadcast into two, with Qin Ke and Ning Qingyun on one side, and the sophomore Three classes cheering in unison.

Qin Ke bowed slightly towards his classmates, then sat down slowly, looked straight at the camera, and said word by word: "Let's get started, I, Qin Ke, am here to accept anyone's questions!"

There was a silence in the live broadcast room first, and then countless 666 brushed up.Regardless of Qin Ke's real level, at least at this moment, his firm gaze, his upright behavior, and the second and third classes of high school behind him made people feel good, and made people feel the flying youth!

After a while, someone finally initiated a mic connection request.

Ning Qingjun clicked to agree, and on the screen on the big screen, the original auditorium screen of Class [-] and [-] on the right was replaced by the screen of Lianmai.

This is a young man with a square face. The background is a bit messy. It is obviously a dormitory for boys. He said hehe:

"My name is Chen Runyu, a third-year student majoring in mathematics at Zhejiang University. I will not bully you. Let me give you a simple question. What is the 'Jordan standard form' and what theorem does it come from? The essence of these two questions is the same Yes, if you really study hard, you won’t be unable to answer.”

Qin Ke said with a smile: "Thank you, Brother Chen, for raising your hand. This is indeed a sub-question. 'Jordan standard form' is a knowledge point of λ-matrix in advanced algebra. Every n-level complex matrix A is related to Similar to a Jordan form matrix, this Jordan form matrix is ​​uniquely determined by the matrix A except for the arrangement order of the Jordan blocks, which is called the Jordan canonical form of A."

"Quick answer, it's amazing, I have to read the book myself. Well, it proves that you have indeed taught Gao Dai by yourself."

Chen Runyu gave a thumbs up in amazement, and disconnected Lianmai.

With the beginning, Lianmai's applications suddenly increased, and the number of simultaneous applications suddenly reached the upper limit of ten.

In order to show justice, Ning Qingyun directly drew a number from the prepared small cardboard box and opened it in public. She drew number seven, and clicked to agree to the seventh person's Lianmai.

The visitor also reported the name of the school first, and then asked Gao Dai's proof question in front of the camera, asking Qin Ke to prove it.

"1. A is a reversible real symmetric matrix of order n, and B is a real antisymmetric matrix of order n. AB=BA. Prove that A+B is reversible."

This question is quite difficult. Normally, even if you have a good grasp of Gaodai, you need at least 2 minutes of thinking to prove your ideas.

The knowledgeable person clicked his tongue secretly, and subconsciously worried for Qin Ke. After all, Qin Ke had said the rules, and he had to start answering within ten seconds.

But Qin Ke only glanced at the question, and answered directly on the new white paper Ning Qingyun handed over:
"Proof 1: It can be known from the question that AA^T is positively definite, BB^T=-B^2 is semi-positively definite, so we can get AA^T+BB^T=A^2-B^2 positively definite..."

Many people in the comment area began to like it: "Ah, the concise and concise proof method, there is no problem."

But I saw that Qin Ke finished Proof 1, and then wrote: "Proof 2: Using the method of proof, suppose the equation system (A+B) x=0 has a non-zero solution, set it as y, from A reversible and AB= BA can get...the conclusion is that 0 is greater than 0, which is obviously wrong, and the original question can be proved."

"Proof 3: Continue to use counter-evidence..."

"Proof 4: Using the substitution method, if you want to prove the original question, you only need to prove that A^-1(A+B)=E+A^-1B is reversible, from..."

Qin Ke wrote four kinds of proofs in one go, and it took only about 3 minutes. He put down his pen, pointed the answer at the camera, and asked, "Brother, I don't know if any of my answers are in your hands. The standard answer is the same?"

The audience was silent, and countless viewers who watched the live broadcast were all shocked. Even netizens who didn’t understand Gao Dai and just came to watch the excitement watched the high school student write four kinds of proofs with ease. There is an inexplicable sense of shock!Not to mention those who know the goods!
　Continue to post the third update of yesterday's guarantee
　　
　
(End of this chapter)