Dreaming can be a boss

Su Lu was a little helpless. Recently, whenever he had free time, he had to study the papers on the mathematics side. Now there is another financial paper. Who can stand it if it is someone else.

He could only nod his head and said, "Okay, I'll prepare when I go back."

"Yeah." Professor Zhang seemed to see Su Lu's helplessness, so he smiled and said, "Looking at how tired you are in class every day, you don't have to take any undergraduate courses you can afford. I'll go and give you those teachers. Talk about it all. From now on, you will try to put your mind on academic research, and you will probably feel bored in those classes."

Su Lu thought about it, and thought it was true. In fact, he didn't even think about taking the courses at the Mathematical Academy. He has mastered the basic knowledge. In academic research, he needs to master it. Whoever masters it more thoroughly will be able to go. Going further, and even researching new mathematics, just like algebraic geometry, a new branch of mathematics, is a new trick developed by many mathematicians in history by combining other mathematics.

So he said with a smile: "Then trouble the professor, don't let other teachers not give me the usual grades."

"Hey, it's up to you. I'll tell you when the time comes, you must make sure you get a score of [-] or higher in all final exams, or you won't get a single score in the usual grades." Professor Zhang said with a smile.

Su Lu thought to himself, am I still afraid?

He said, "No problem."

"You boy!"

Seeing Su Lu's expression of indifference, Professor Zhang couldn't help laughing or crying, and said teasingly: "Then it's a deal, if I don't get full grades in the end, I will arrange more tasks for Ning Shiyuan to keep her busy every day." , and then you kid can spend more time studying."

Su Lu was taken aback. Although he never thought of hiding his relationship with Sister Shiyuan in front of Lao Zhang, he was still a little embarrassed when it was brought up unexpectedly.

"Uh... Well, Sister Shiyuan and I actually..."

"Go, I'm too lazy to listen to your explanation." Professor Zhang said angrily, "Hurry up, Shiyuan is waiting for you outside, right? I saw her wandering around the door just now, you two, be careful, don't give me any trouble." I delayed my studies, see if I don't clean up you."

"I promise not!" Su Lu chuckled, then got up and said goodbye: "Then I'll go first! Goodbye, professor."

Professor Zhang waved his hands with a calm face, until after Su Lu went out, he heard the laughter of men and women from outside the corridor, and the professor couldn't help shaking his head again.

"These two children."

Chapter 76 Proof

The time has entered mid-October. As a coastal city, the temperature in Shanghai has not dropped as fast as in the mainland, but it has also become much cooler. The lowest temperature is about ten degrees every day, and the highest temperature basically does not exceed 25.

Girls who want style but not warmth still wear cool and tempting clothes, but those who want warmth mostly take off their singles and wear doubles.

But for Su Lu, his body was getting stronger all the time, so he didn't feel much about temperature changes, but in order to cater to the fashion after autumn, he put on a long sleeve.

In the library of the University of Finance and Economics, Su Lu was dealing with the draft paper in his hand.

Since getting Professor Zhang's permission, Su Lu seldom went to class again, including the School of Mathematics. He also talked to Dean Jiang. At first, Dean Jiang wanted to persuade him, but after hearing it, his The paper already has ideas and needs more time to study, so I didn't say more.

After all, Su Lu shouldn't be seen as a freshman or sophomore, but should be seen as a senior or even a graduate student. He can't get much knowledge from class, and it's impossible for the teacher to only take care of him while teaching. To talk about some difficult content, those undergraduates don't understand anything.

So, now Su Lu is like a graduate student, all the time is arranged by himself.

He really likes it, so that he can stay with his sister every day.

only……

Ning Shiyuan, who was sitting next to Su Lu, sighed.

She was no longer in the mood to pay attention to Su Lu who was studying mathematics. At most, she was tired of reading and took a photo of Su Lu buried in calculations full of resentment.

Who told him to start working hard every time he came to the library and sat down, without saying or asking, unless Ning Shiyuan took the initiative, otherwise he would never say anything during his research.So two people stay together, but it's no different from students who don't know each other but sit and study together.

Turning his head and glanced at Su Lu, he changed another piece of draft paper just now, but he didn't scribble calculations or draw pictures on it like before.

Su Lu has gradually developed a habit during this period of learning mathematics, that is, when doing a problem, he likes to write here, there, or even crookedly on the draft paper, which looks messy. When others see it, they will never imagine how his train of thought is extended.

But by virtue of his brainpower at this time, he can clearly remember where each step of his calculations is on the draft paper, and he has also developed a skill. As long as he finds the wrong direction during the calculation process, he will never be able to Going in this direction again, this is a problem that many people often have when researching problems, because of lack of thinking ability, the places that were missed before, after modification, wandered back to this wrong place.

Ning Shiyuan didn't know about this, she only knew that Su Lu's mathematical ability was very strong, so strong that it was difficult for her to recognize any calculation formula on the draft paper.

But at this time, Su Lu began to write neatly line by line on this draft paper, one by one mathematical symbols, letters, Latin and Chinese characters, etc., neat and full of beauty.

Moreover, Su Lu seemed to show a complacent smile.

She leaned over curiously and looked at the paper.

"Cauchy's Mean Value Theorem: Let the functions f(x) and g(x)... make (f(b)-f(a))/(g(b)-g(a))=f'(ξ)/g '(ξ)—Formula 1...Therefore, according to the inner product property of Euclidean space, formula 1 can be transformed into...From formulas 4, 6, and 7, it can be seen that in any case, in the interval (a, b ) there is always a point t such that [f (b)-f(a)]g&039;(ξ)-[g (b)-g (a)]f&039;(ξ)=0.

If f&039;(x) and g&039;(x) are not zero at the same time, formula 1 is established, and the theorem is established. "

Su Lu then took out the ruler and drew the picture seriously, but the smile on his face couldn't be concealed.

Ning Shiyuan saw him draw a picture for the first time, but she was confused by mathematics, and finally couldn't help asking: "Brother, you are so happy, did you prove it?"

Su Lu finally raised his head. When he saw the elder sister next to him, he couldn't restrain the joy in his heart. Then he put down his pen, and regardless of the crowds in the library, he hugged his elder sister's waist and slapped her face like a surprise attack. A watermark was left on it.

Ning Shiyuan was stunned, she never expected that she would be kissed by Su Lu forcefully, and it was still in the library surrounded by people.

Although the kiss wasn't on the mouth, Ning Shiyuan was still shy and annoyed, since this was the first time she was kissed since they acquiesced in their relationship.

Feeling the gazes cast from time to time around her, Ning Shiyuan didn't know whether to clean up Su Lu or quickly bury her face, she felt her face was burning.

And the boys and girls who saw this scene also didn't expect that since they sat in their seats, they would go to see it from time to time, and the seductive beauty/handsome guy actually has an owner!

The boys around got lemons, and the girls got jealous.

But the instigator of all this, Su Lu, just said to his sister: "Wait until I finish drawing the last picture."

Then he buried his head and continued to manipulate the ruler and pen.

Ning Shiyuan pouted, very unhappy.

Baby...my sister is very angry and wants my brother to hug...explain.

If Su Lu doesn't give her a better explanation today, she will have to punish her, and she can't be used to it.

However, Su Lu's method of drawing pictures brought her great surprise. She saw that his ruler just moved casually, which was the standard plane Cartesian coordinate system. A perfect arc appeared, a curve represented by a parametric equation appeared, and then a tangent line was drawn randomly, which was very straight.

Ning Shiyuan was dumbfounded again.

Then Su Lu began to write: As shown in the figure, the tangent line at the maximum point of the distance from the curve to the straight line ab is parallel to ab.

At this point, I stopped writing. Regarding the completion of the proof process, Su Lu once again showed a happy expression.

From the middle of September, he began to look for proof ideas, and after so many days, he finally added a new method for the proof of Cauchy's median value theorem from scratch, and this method is different from other methods. The methods of proof are different.

Through a special method, he transformed this differential calculus proof problem into the Euclidean space, and then used the inner product property of the Euclidean space to solve this problem skillfully.

Because after taking Professor Fu Yan's class that time, his interest in European space has greatly increased, and he has studied it in depth, including studying with several mathematics masters in this field in Universal Dream, so he is very happy. Understand, so after choosing the proof of Cauchy's mean value theorem, he thought about how to transform it into the Euclidean space.

And now it turns out that he succeeded.

Chapter 77 Are you so fast?