Chapter 21: Library [Recommended ticket is not ferocious]

Looking at the math problem he was doing, Zhang Yang proudly clamped the paper in the book. He had a great sense of accomplishment. He estimated that this problem was put in it by a classmate who could not do it.
Zhang Yang didn't know. When he was focusing on the problem, the old man he met during the day was looking at him not far away, and seemed to be thinking.
...
That night, Zhang Yang slept well, and he had money, and he slept soundly, and while he was lying in bed, the old man was sitting on the desk with the "Principles of Computational Fluid Dynamics" on it, The paper was held in the old man's hand.
This is a three-dimensional geometry that Harvard Institute of Technology students can only understand. As a junk school that doesn't even learn plane geometry, such a character actually appears, which shocked the old professor.
Although the elderly lived in the City of Arts and Sciences in C, they are actually professors at Harvard University of Technology. After retirement, they returned to their hometowns to take care of themselves. They only occasionally gave a few lectures in the school.
Of course, it wasn't Zhang Yang who made this question shocking the old man, but Zhang Yang's method of solving the problem. This question was solved not only with the knowledge of solid geometry, but also with plane geometry. The way to answer this is to let the old man They are full of excitement.
Because the method of solving the problem was too simple, it made him incredible. Zhang Yang first inferred the formulas of three-dimensional geometry by the method of plane geometry, and then solved the problem with his own formula.
The old man didn't know that Zhang Yang was completely kind. He was afraid that the classmate who left the note could not understand, so in the simplest way, he didn't know that his kindness would shock an old man.
The old man sighed and gently put down the paper in his hand. He felt a little excited. This feeling has not appeared for a long time. Remember, this feeling appeared many years ago many years ago. A flash of sorrow flashed ...
...
There was a professional class this morning. Zhang Yang had a big bed. No matter if he was a junior or senior, Zhang Yang's professional classes generally go to him. He has his own set of standards for living. He believes that since he has studied this major, It's a little bit more or less.
Chen Xi shined on the window, Zhang Yang glanced at the curtain half-opened, and couldn't help but swallow. After all, Zhang Yang couldn't help but tempted to go to the curtain to open the curtain gently ...
"Well ..."
"Well ..."
Zhang Yang was startled. He just opened the curtains, and there was a sound of pulling the curtains on the opposite floor. According to the truth, Zhang Yang could not hear at such a long distance, but he heard it.
Zhang Yang quickly drew the curtains and looked out of the gap. I saw that the curtains of the dormitory building were closed, and many curtains were still swaying. Obviously, that was just pulled ...
I couldn't help but feel depressed for such a good day. It was a good voyeur, but I knew I had seen nothing because I had done something stupid.
"Brother, don't bother, as long as there is a little movement of the curtains on our side, they will be pulled up all the way." Zhang Yang's roommate stretched out his head.
"Ah ... keke ... no ... I just want to ventilate ..." Zhang Yang embarrassed.
"Zhang Yang, we also want to ventilate, but now, even if ventilating is also suspected, let's pull the curtains. If you want to see it, it's the same in the seam. Rest assured, we won't tell you ... ... "Another roommate also poked his head.
"..." Zhang Yang was speechless.
"Zhang Yang, we also lived together for a few years, and no one blame you for that, but we always have a question to ask you." Another guy showed his head from the bed.
"Well?" Zhang Yang said secretly, but he had to bite the bullet and said.
"Why do you send those photos to us, how good our brothers are in the dormitory, hey ..." The roommate who spoke was a deeply regretful expression.
"That and that ... you guys talk, I have to go to class, and I have to prepare. You also know that our professional preparation will take a long time ..."
Zhang Yang fled.
This morning, Zhang Yang spent all the time in the studio. He painted some plaster heads dull and boring. Finally, he drew a pair of watercolors before leaving the studio. After lunch, he went straight to the library.
The library was very deserted, and Zhang Yang saw the old man again, and the two nodded to each other and then read their books.
For Zhang Yang's introverted surname, he didn't like social activities at all, not to mention that the old man seemed too old and was not the object of his communication.
This time, Zhang Yang brought a pen and paper. Every time he picked up a book in the library, he had a wish to calculate on it.
Time passed slowly, and Zhang Yang's speed was still too fast. It would be difficult for a book to exceed half an hour and he would change it. Occasionally, when he encountered a problem, he would pause and pick up a few strokes.
Zhang Yang is getting more and more extensive, proportional analysis, algebraic methods, logical methods, ordinary differential equations, fluid mechanics ... Almost, he has begun to cover some subjects from design to mathematics.
Soon, Zhang Yang discovered that the books in the library could not meet his expectations.
In fact, this school is just a junior college, and the investment in the library is low. Many books have not kept up with the times. Fortunately, the school has a long history, and there are still some materials. Otherwise, Zhang Yang can't see it anymore. How long, after all, Zhang Yang now has a fairly large selection of surnames for reading, and the scope of information books in many schools is quite narrow.
At about 5 pm, Zhang Yang had lost interest in some math books on the bookshelf, and began to move around in the library in a boring manner, trying to find out some relevant information that was interesting ...
"Zhang Yang?"
"... Du Xue!"
While Zhang Yang was strolling around, a crisp girl voice came from behind. Zhang Yang looked back, but it was Du Xue.
"I'm sorry." Du Xue saw Zhang Yang, stirred her horns and lowered her head, her ears and neck turned red.
"Oh, it's okay, do you read a book?" Zhang Yang didn't want to be entangled in that issue.
"Yes, I come here to read books every day. I like this atmosphere ... By the way, what books do you read?" Du Xue felt relieved when she saw Zhang Yang.
"Nothing like it, just flip it ..."
Zhang Yang smiled and put the Book of Mountains and Seas on the bookshelf. He had read it when he was very young, and just flipped it casually just now.
"What kind of books do you like to read?"
"I'm not interested. I used to like novels, but I've been busy recently, so I haven't gone out."
"Ah ... do you like to read novels?" Du Xue was excited.
"Well, pass the time."
Looking at Du Xue's white and tender skin, she fluttered her heartbeat for a while. Du Xue is the kind of girl who looks more and more beautiful. The softness and weakness can easily make people have a kind of protection. In fact, when on the train, Zhang Yang's sudden outburst of courage is also related to Du Xue's weak temperament. In the hearts of every man, there will be subconscious protection of the weak macho ... [Recommendation ticket is not ferocious]