Chapter 10 Library
At six o'clock in the evening, the sun is not so harsh. It shines on my body, making it warm and comfortable.
At this time, several nearby streets have not been renovated, making people feel crowded and warm when walking on the road.
Xu Qingzhou walked briskly and found the district library by following the route in his memory.
He browsed in the natural science area for a few minutes and found a copy of Gilbert Strong's "Introduction to Linear Algebra". He was familiar with this book and took it out out of pure nostalgia, as well as Gauss's work on calculus and geometry. "General Study of Surfaces"
Halmos's "NaiveSetTheory" (Naive Set Theory).
The first two are Chinese versions, and the latter is the original English book.
His mathematics is quite strong, but can be limited to certain fields, such as mathematical physics equations related to quantum mechanics, line generation, complex variable functions, etc. He has no systematic exposure to higher mathematics research.
For him, mathematics is just a tool, not the main research direction. It was not until he encountered a large number of calculation problems in his research that his computing power was stretched and he could only need the help of mathematicians. Then he realized that physics is inseparable from mathematics.
The study room on the first floor was packed. Xu Qingzhou carried three books and went to the second floor.
At this time, the sharing economy has not taken off, let alone the popular shared study rooms, so there are generally not many study room seats left in libraries during holidays.
Sure enough, there were fewer people on the second floor, but there were also not many seats. The most important thing was that there were two people beeping as if there was no one around.
The third floor is finally better.
Looking for a seat by the window, Xu Qingzhou was a little surprised when he saw the figure by the window.
Beside the window, the girl has exquisite facial features, a straight nose, round red lips, crystal clear eyes under thick eyebrows, exquisite collarbones, smooth and delicate exposed skin, and soft long hair draped over her shoulders. The draft blows through, raising the girl's head. A few strands of hair on the forehead.
She lowered her head, tapped the pen tip lightly, and frowned slightly.
Oops, we met again.
He and Song Yao are really destined.
As if she sensed that someone was looking at her, Song Yao raised her head, and the moment she looked at Xu Qingzhou, a look of astonishment flashed in her eyes, but it quickly disappeared.
Xu Qingzhou nodded in greeting and sat down opposite her with a book in his arms. Is there any room around him? Yes, but you can still look at beautiful women in your spare time while reading, which is better than smiling at each other with Big Brother.
Song Yao was very quiet, doing math papers.
She went home and changed into a white dress. She was pure and lovely, but she also had a cold temperament that would make people thousands of miles away.
Sitting opposite her, Xu Qingzhou could even smell a faint fragrance.
After Song Yao graduated from undergraduate school, I heard that she was going to study abroad. There was no news after that, and she didn't even attend the student party. Many classmates regretted not seeing the school beauty Song again.
Putting aside his sighs, he opened the "The Theory of Naive Sets" in front of him and read it carefully.
On the opposite side, Song Yao was stumped by the 16 fill-in-the-blank questions. She planned to relax for a while and began to secretly observe Xu Qingzhou.
He was fascinated by the book on the right, Introduction to Linear Algebra? The other one is an English book, I don’t recognize it.
Is Xu Qingzhou following me? But he was indeed taking notes.
Linear algebra, I heard Lao Liao say that this is a knowledge point that can only be learned in college. Is Xu Qingzhou reading it now?
Song Yao’s mind was filled with questions. What should she do? She was curious and wanted to ask.
It can be seen that Xu Qingzhou is very serious, but she still gave up.
The evening sunlight reflects through the glass and shines on the edge of the desk. The entire reading room is bathed in golden light. Song Yao is still studying math problems.
I don't know how much time had passed, but Xu Qingzhou felt someone poke his arm.
Looking up, he saw Song Yao looking at him and asking softly: "Xu Qingzhou, can you do this question?"
In her opinion, Xu Qingzhou's mathematics was quite satisfactory, but after seeing the books he read, she changed her view.
Xu Qingzhou took the test paper.
Let the function f(x)=ax+bx+cx+d, where a≠0. It is known that f(-1)=f(0)=f(1)=0, the slope of the graph of f'(x) at x=1 is 9
Function analysis question, it is true for high school There is difficulty. "Lend me your draft book."
"good."
He wrote very carefully and laid out every step.
Two minutes later.
Xu Qingzhou handed the draft to Song Yao.
[We know from the meaning of the question that the function f(x)=ax+bx+cx+d.
f(1)=a+bc+d=0
f(0)=d=0】
After reading it, Song Yao was shocked.
When did Xu Qingzhou become so good at mathematics?
She looked at Xu Qingzhou suspiciously, but found that he was already reading with his head down.
He is so cold, even colder than her.
Song Yao pursed her lips, suppressed the small resentment in her heart, and seriously devoted herself to the ocean of mathematics.
Time passed by minute by minute.
At ten o'clock in the evening, Xu Qingzhou closed the book and looked at Song Yao opposite, "I'm leaving."
"Well, I have to leave too." Song Yao looked at her phone and started to pack her things.
Xu Qingzhou stood up and put the three books back to their original places, only to find that Song Yao was waiting for him next to him.
The borrowing process in the library is very troublesome now. He has a lot of materials to look for, and it is troublesome to borrow them back and forth. Anyway, it is only ten minutes away from here, so it is better to read them here directly. The two came out of the library.
"Xu Qingzhou, the college entrance examination is coming soon, why don't you review?" Song Yao still asked her doubts.
"I'm pretty familiar with the contents of high school. Let's learn some extracurricular knowledge to gain some insights." Xu Qingzhou was familiar with the old streets around him.
If he remembered correctly, the community on the left will be demolished next year, and the others will also be renovated in the next few years.
When I came back from freshman year, there were holes everywhere, just like the battlefield in Syria.
Song Yao suddenly found that the Xu Qingzhou in front of her looked strange. She followed Xu Qingzhou for a while and asked, "I don't understand something. With your strength, you can achieve both fame and fortune. Why do you have to keep suppressing your score and become a An unknown person."
"There are three types of people in the world, ordinary people, geniuses, and one type, gods. I belong to the last type. In order not to cover up the light of ordinary geniuses like you, I choose to hide myself."
Song Yao was so angry that her teeth hurt. What do you mean by ordinary people? She is also very powerful!
She wanted to refute, but found that Xu Qingzhou's attention had already gone to a nearby rice noodle shop.
Yes, after thinking for several hours, Xu Qingzhou was really hungry.
However, he thought of a more serious problem.
The clothes I just changed are cleaner in my pocket than my face.
He looked at Song Yao and sincerely invited: "Would you like some rice noodles? I'll treat you."
"I'd better ask you, thank you for giving me the lecture." Song Yao shook her head.
"Okay." Xu Qingzhou agreed readily and strode towards the store. "This store tastes very authentic. Maybe we can open a branch in a few years."
He remembered that this community had been demolished, and the boss actually opened four or five chain stores. He had been to one of them, and it didn't taste good.
Song Yao froze on the spot, suddenly feeling like she was being tricked.
(End of chapter)