"The proof process of this question is very cumbersome, and it cannot be written on the blackboard. Shen Qi said.

"Shen Qi, your idea of this method of proof is very thorough, but the process is really cumbersome. Either way, you've got a blackboard, so you'll have to prove it anyway. Professor Lu said that he wanted to see Shen Qi complete the proof: "How many blackboards do you need?"

Shen Qi thought for a while and said, "1.5 to two blackboards should be enough." ”

"Please proceed with your proof. Professor Lu picked up the blackboard eraser and handed it to Shen Qi, and then asked the students in the audience: "The first part of the proof that Shen Qi wrote on the blackboard is based on the derivation of Fargnano's theorem, have you all understood?"

Everyone shook their heads: "I don't understand." ”

Shen Qi explained: "When I write all the proofs, everyone will understand. ”

Someone said, "The problem is that if you erase the previous proof and continue to write the later one, then we can't remember the previous one." ”

Professor Lu prompted: "You can write down the content on the blackboard in a notebook, you don't need to copy it all, just extract the core steps." ”

"Which steps are the core steps?"

"This, this, and this. Shen Qi knocked on several different parts of the blackboard.

Zhou Yu'an was more flexible, he secretly took out his mobile phone and took pictures.

Then the other students began to follow suit and take pictures.

Professor Lu turned to face the wall, opened one eye and closed the other: "Give you 10 seconds to extract the core steps on the blackboard." ”

Within 10 seconds, the students in the audience saved the first part of Shen Qi's proof on the blackboard through their mobile phones.

It's good to have a mobile phone, and the data transfer .jpg is completed in a few seconds

Copying the mathematical symbols of a blackboard by hand takes several minutes, and may not be enough.

"Then I'll wipe it. Shen Qi said to his classmates.

Students: "Rub." ”

Professor Lu turned around, and Shen Qi erased the first part of the proof on the blackboard and continued his verification.

Next, Shen Qi processed the key equations through Euler's addition and multiplication theorem, which is a rather complicated process, and the amount of computation is not very large, and the difficulty is to switch between derivation logic.

The hardest part of counting is not calculating, but not being able to calculate it, not knowing how to calculate it.

Obviously, the integral of dx/√ [X] cannot be obtained using a circular or logarithmic function, and Shen Qi needs to find an algebraic relation full equation (22).

Shen Qi transforms the coefficients and the lower bound of the integration in the third integral root formula by the sum of the integrals of two ∫dx/√ [R(x)], which costs half a blackboard.

When Shen Qi got the algebraic function of the common lower bound and the corresponding values at the two upper limits, the blackboard was filled again, and it was so dense that he couldn't even insert a ∫∫.

Shen Qi's proof is here, and there are already smart classmates in the audience who have mastered the core secret.

"I see, I see. ”

"I should have thought of it, I should have thought of it. ”

"Shen Qi is a cow breaker, a very bullish road. ”

"It turned out to be ...... Legend's three types of points!" Zhou Yu'an slapped his thigh, who could have thought of this kind of proof, I'm afraid even Professor Lu couldn't think of it in a short time.

"His logic is hard to understand, but it's powerful. Ou Ye took the initiative to say something to Zhou Yu'an, and through this proof question, she also learned something from Shen Qi.

Zhou Yu'an: "Yo, it's the first time you've said such a long sentence to me, and let me digest it." ”

Jingle bells.

At this time, the bell rang for the end of class.

Shen Qi had filled the two blackboards, but his proof was still unfinished, and he was still almost done.

"This ......" Shen Qi was out of line, "Class is over, let's stop here today, Professor Lu?"

Professor Lu waved his hand: "No, the class will be out after the certificate, only the last few steps are left." ”

Then Professor Lu personally picked up the blackboard eraser and helped Shen Qi erase half of the blackboard: "The proof that is not completed and the one that has no ending is equally regrettable." ”

"Okay. Shen Qi made a big move, with a light hand speed, and completed the last few steps on the blackboard.

The chalk writing was already a little scribbled, and ∫∫∫∞∈ looked like some kind of mysterious symbol, as if it was linked to a void circle from another dimension.

The students in the audience were demented and even a little intoxicated.

More and more students gathered at the door of the classroom, who were not from the school, came to class, and the next session was college English.

"Who is he?"

"What is he doing?"

"He's a student, isn't he?"

"This ...... What the hell is this?"

"Ghost Drawing?"

"Math class?"

"Isn't this Shen Qi, from the Shuyuan. ”

"Sure enough, math or something is similar to metaphysics, he should summon a pet beast out, right?"

The crowd of students at the door watched the excitement and talked about it.

Finally, Shen Qi finished all the proofs, spending a total of 2.5 blackboards.

"Done. Shen Qi said to Professor Lu.

Professor Lu said: "If Shen Qi starts with the 24th equation and uses the algebraic relationship between the integrals of the double new lines, you can save half of the blackboard, or even more. ”

"Professor Lu is right, I didn't think it through. Shen Qi nodded and humbly accepted Professor Lu's suggestion.

"You're already wonderful, and it would have been impossible for me to think of this kind of proof in a short period of time and complete it if I had been thirty years ago. Professor Lu admired Shen Qi very much, and said to the students at the door, "I'm sorry, I'll get out of class immediately." ”

"Is this kind of evidence that the bald professor said is very hanging?" the student at the door was unaware.

"Hell, we are liberal arts. ”

"What's the matter with this Shen Qi, pretending to be X just a few days after school started?"

"Technical pretending to be X, I can't understand what he's writing at all, but it feels very powerful. ”

"Math or something, it's too lethal. ”

Professor Lu turned to the students of the School of Mathematics and said, "Time is limited, so I won't explain this proof question in detail today, and I will talk about it in the next class." ”

Then the students from the Mathematics Academy left the venue, and the students from the other colleges entered the field for English classes.

The Department of Mathematics and the Department of Science and Engineering Computing had no classes in the morning, and Shen Qi walked towards the building of the Academy of Mathematics alone.

Entering the building of the Academy of Sciences and finding Sun Erxiong, Shen Qi put forward some thoughts: "Professor Sun, I don't have any acquaintances at Yan University, so I know you best, and I want to tell you something in my heart." ”

Sun Erxiong: "Say." ”

"Professor Sun, you asked me to go to the big classroom to re-learn the basic courses of mathematics majors such as counting, advanced generation, and solving a few points, I did as you said, after a week of practice, I think Professor Lu, Professor Qu and your Professor Sun, you all gave good lectures, but ...... I'm embarrassed. Shen Qi was a little distressed.

"Oh?"

"I've taught myself several times, but I can also understand that professors have to take care of most of the students. It's hard for me to do it in a big class, I can't show my level if I don't play it, and if I play too much, it's easy to pull hatred, and it's okay for a week. One semester, one year, I'm afraid that the impact will not be good, and it will not be conducive to the unity within our math academy. ”