Chapter 171

Among the four major journals in the field of mathematics, according to the ranking of impact factors, the Annals of Mathematics is the first place deservedly.

In second place is "New Advances in Mathematics".

This is a journal published and printed by Springer Verlag, a well-known German publishing house, with an impact factor of 12.58.

In addition, compared with the other three journals, the reviewers of New Advances in Mathematics generally have a more friendly attitude towards Chinese mathematicians.

To be more precise, it does not discriminate against Chinese mathematicians.

The manuscripts submitted by Chinese mathematicians are treated the same as those submitted by other mathematical powers.

Unlike the Annals of Mathematics, the Journal of the Chinese Mathematical Society, and Acta Mathematica Sinica, there is a biased attitude towards the submissions of Chinese mathematicians.

For those papers submitted by Chinese mathematicians whose level lies in the inclusion or non-inclusion of papers, the treatment method of non-inclusion is generally adopted.

In the final analysis, it is the reason why Huaguo's status in the international mathematical community is too low.

Fortunately in the last century, after entering the millennium, the group of mathematicians at the top of the world pyramid were almost non-Chinese.

The only one is only a Chinese, not a Chinese.

Therefore, after some consideration, Gu Lu still chose to submit the journal "New Advances in Mathematics".

Senior Brother Gao also had no opinion.

Next, it is time to compile the results of the research into a thesis.

It's not a lot of work.

With Senior Brother Gao's help, even if Gu Lu only spends one or two hours of free time every day, a week is enough to do it.

…………

The weather in Yanjing has gradually shown signs of winter.

From time to time, the cold wind howled, and although it was not accompanied by snowflakes, it still brought a biting chill.

Gu Lu put a white sweatshirt under the windbreaker, wrapped a scarf around it, and came to the classroom while tightening his clothes.

This week is the 12th week of the fall semester of freshman year.

According to Yenching University's academic calendar, the fall semester of 2017 is about 18 weeks long.

Among them, the seventeenth and eighteenth weeks are exam weeks.

In other words, Gu Lu still has five weeks of teaching time this semester.

In the lesson, Gu Lu has already preached the last chapter of the first book.

"Today we're going to talk about Chapter 6, Indefinite Integral. As we all know, finding the derivative of a known function is a very interesting problem, because the solution of various physical and geometric problems often boils down to finding the derivative of a function. ”

"But we must also see that on the other hand, the solution of many practical problems does not boil down to finding the derivative of a known function, but, on the contrary, to seek an unknown function so that it is its derivative. That's what it's all about us learning indefinite integrals!"

An indefinite integral, in simple terms, is the inverse of the derivative.

Gu Lu gave a very simple example.

"Let's say that your class leader, Bi Qi, accidentally fell from the roof of the building. It is known that the distance of Bizzy descent in the air is s=s(t), if you find the velocity of Biqi at a certain point, you can find the derivative expressed by v(t)=s'(t), but if you know the instantaneous velocity of Biqi at a certain point in the descent process, the distance of Bizzy in the air is required, you need to use the inverse operation of the derivative. ”

"Expressed in indefinite integrals, it is ∫v(t)dt!" Gu Lu wrote this formula on the blackboard.

"Teacher, I have a question. Zhang Zhenzhen raised his hand.

Say. Gu Lu patted the chalk foam on his hand and asked.

"Why did Bizzy fall from the upper floor?"

"Don't worry about these details. ”

…………

When I gave a high math class to the medical school students on Wednesday, I noticed that nearly 100 people in the class were all wearing white lab coats.

"Who are you?" asked Gu Lu.

"Oh, teacher, we just came back from a lab class on systematic anatomy. A female student sitting in the front row replied.

For the course of medical students, Gu Lu is not very familiar.

So he asked, "What do you do in your lab classes?"

The female student replied, "It's nothing, the teacher just let us observe the location of the stomach, lungs, liver and kidneys." By the way, we were also given the uterus and ** soaked in formalin, and let us observe their morphology and characteristics. ”

"Of course, the hepatobiliary system, the teacher also explained it to us. Finally, let's observe the characteristics of the male urethra, which I have not seen before, which is quite novel. The female classmate's tone was very flat, as if she was simply laying out a straightforward narrative.

And Gu Lu, who was listening, kept changing.

The female classmate continued to talk next to her, "The teacher said that he would take us to the plasticization specimen station for the next experimental class, to be honest, I have some expectations." ”

Plastinated specimen exhibition, referred to as "human corpse exhibition".

"I heard from the teacher that the muscles of the plasticized human specimens are still elastic, the color is similar to that of fresh muscles, and the blood vessels are as beautiful as seaweed. The taxidermy is beautifully made, and the body movements of the human specimen are lifelike. I'd love to touch it then. The other little girl next to her had her eyes lit up and agreed.

Then, the two girls had a lively conversation about the next observation of human specimens.

He even boldly imagined whether he could steal a piece of skull and put it in the dormitory for collection.

If you really can't do it, you can also have a spine!

Gu Lu walked away silently.

No way, it's too heavy.

Gu Lu couldn't bear it.

Since there were still a few minutes before class, Gu Lu casually wandered around the classroom.

By the way, overheard the conversation of some classmates.

In the back row, several female classmates were chattering about something.

"You took the systematic anatomy test yesterday, and how did you choose the multiple-choice question that asked the *** position?"

"I forgot the answer, and I just got one. ”

"I forgot, guess, too. ”

"Me too. ”

Several people shook their heads.

One of the female students was very happy and proudly said, "I forgot about it at the time, but I thought about it again! Aren't I just a living specimen? So I counted it! I filled it in! Wowhaha, I'm not very smart!"

"Amazing, amazing, I didn't think of it at the time. ”

"Kiki, your brain circuit is very clear. ”

The girl called Kiki waved her hand unconcernedly, "Basic operation, basic operation." ”

"Which answer did you choose?" asked another girl.

Kiki replied in a very proud tone, "Third to seventh!"

Everyone: "......"

"Hey, why do you all have such expressions?" Kiki was puzzled.

"Kiki, the correct answer to that question is the second to the sixth rib. Someone silently explained.

Kiki: "......"

"Kiki, I'm talking about you, aren't you, your breasts are sagging?"

Kiki: "......"