Looking at the math problem he did, Zhang Yang put the piece of paper in the book with a proud expression, he had a great sense of achievement, and he estimated that this problem was put in it because a certain student couldn't do it.

Zhang Yang didn't know that just as he was concentrating on the question, the old man he met during the day was watching him from a short distance, as if he was thoughtful.

……

That night, Zhang Yang slept well, had money on his body, and slept soundly, and while he was lying on the bed, the old man was sitting on the desk, and on the table was the book "Principles of Computational Fluid Dynamics", and the paper was held in the old man's hand.

This is a three-dimensional geometry that only a Harvard Institute of Technology college student can understand, and the old professor was shocked that such a figure appeared in a garbage school that did not even have a good level of plane geometry.

Although the old man lives in the College of Arts and Sciences in City C, he is actually a professor at Harvard Institute of Technology, and after retirement, he returns to his hometown to retire, and only occasionally makes guest appearances in the school to give a few lectures.

Of course, what shocked the old man was not that Zhang Yang made this problem, but Zhang Yang's method of solving the problem, which was not only solved with the knowledge of three-dimensional geometry, but also solved with plane geometry, and this way of solving was to make the old man full of excitement.

Because the method of solving the problem is too simple, so simple that it is unbelievable, Zhang Yang first deduced several formulas of solid geometry in the way of plane geometry, and then used his own formula to solve the problem.

The old man didn't know that Zhang Yang was completely kind-hearted, and he was afraid that the classmate who left the note wouldn't understand, so he used the simplest method, he didn't know that his kindness would cause an old man to be so shocked.

The old man sighed, gently put down the piece of paper in his hand, he felt that he was a little excited, this feeling has not appeared for a long time, remember, this feeling was many years ago, many years ago, the old man's eyes couldn't help but flash a trace of sadness......

……

There is a professional class this morning, Zhang Yang got up a big morning, whether it is a junior or a senior, Zhang Yang's professional class will generally go, he has his own set of standards for life, he thinks, since he has studied this major, how much is also a point.

The morning sun shone on the window, Zhang Yang glanced at the half-open curtains, and couldn't help swallowing a mouthful of saliva, after all, Zhang Yang couldn't help but be tempted to gently walk to the curtain and open the curtain......

"Click......

"Click......

Zhang Yang was startled, he just opened the curtains, and there was a sound of pulling the curtains from the opposite building, according to reason, Zhang Yang should not be able to hear it from such a distance, but he heard it.

Zhang Yang hurriedly closed the curtains and looked through the gap, only to see that the curtains of the dormitory building behind him were closed, and many of the curtains were still swaying......

I couldn't help but feel depressed for a while, such a good weather was a good day for voyeurism, but I knew that because I had done something stupid, I couldn't see anything.

"Brother, don't bother, as long as there is a little movement of the curtains on our side, they will all be closed over there." The roommate who flamboyed the upper bunk stuck his head down and said.

"Ah...... Ahem...... No, no...... I just figured out the ventilation ......," Zhang Yang said embarrassedly.

"Zhang Yang, we also want to ventilate, but now even ventilation is also suspected, let's draw the curtains, if you want to see it, it's the same in that crack, don't worry, we won't tell the truth......" Another roommate also poked his head out.

"......" Zhang Yang was speechless.

"Zhang Yang, we have lived together for a few years, and no one blames you for that incident, it's just that we always have a question for you." Another guy peeked out of bed.

"Huh?" Zhang Yang secretly said that it was not good, but he had to bite the bullet.

"Why are you posting those photos on the Internet, how good are our brothers in the dormitory, hey......" The roommate who spoke had a deeply regretful expression.

"That and that...... You talk, I have to go to class, I have to prepare, and you know, it takes a long time to prepare for our major......"

Zhang Yang fled in the wilderness.

This morning, Zhang Yang spent all the time in the studio, boring and boring painting some plaster heads, and finally painted a watercolor before leaving the studio, and after lunch, he went straight to the library.

The library was deserted, Zhang Yang saw the old man again, and the two nodded to each other before burying their heads in reading.

For Zhang Yang's introverted surname, he doesn't like social activities at all, not to mention, this old man seems to be too old, and he is not the object of his friendship.

This time, Zhang Yang brought pen and paper, and every time he picked up a book in the library, he had the hope of calculating on it.

Time passes slowly, the speed of Zhang Yang is still ridiculously fast, it is difficult for a book to exceed half an hour, he will change the next book, occasionally encounter a problem will pause and pick up the pen and stroke a few times.

Zhang Yang is involved in a wider and wider range of methods, such as proportional analysis, algebraic methods, logical methods, ordinary differential equations, fluid mechanics, ...... Almost everything, from design to mathematics, he began to dabble in.

Soon, Zhang Yang found that the books in this library could no longer meet his reading expectations.

In fact, this school is just a last-class school, and the investment in the library is also thought of less, many books have not kept up with the times, fortunately, the history of the school is still quite long, and there are still some materials, otherwise, Zhang Yang will not be able to read for long, after all, Zhang Yang's reading now has a considerable choice of surnames, and the scope of information books in many schools is also quite narrow.

At about five o'clock in the afternoon, Zhang Yang had lost interest in some of the math books on the shelves, and began to wander around the library in all kinds of boredom, trying to find some relevant materials of interest......

"Zhang Yang?"

“…… Du Xue! ”

When Zhang Yang was wandering inside, a crisp girl's voice came from behind, and Zhang Yang looked back and saw that it was Du Xue.

"I'm sorry." When Du Xue saw Zhang Yang, she lowered her head by stirring the corners of her clothes, and her ears and neck were red.

"Hehe, it's okay, you also read?" Zhang Yang didn't want to dwell on that issue.

"yes, I come here every day to read and I love the atmosphere...... By the way, what books do you read? Du Xue saw that Zhang Yang didn't seem to take it seriously, and immediately breathed a sigh of relief.

"I don't like anything, just flip through it......"

Zhang Yang smiled and put the "Classic of Mountains and Seas" in his hand on the shelf, he had read this book when he was very young, and he just flipped through it casually just now.

"What type of books do you like to read?"

"I'm not interested in anything, I used to like to read online novels, but I've been busy lately, so I haven't gone out."

"Ah...... Do you also like to read web novels? Du Xue looked excited.

"Yes, pass the time."

Looking at Du Xue's white and tender skin, Zhang Yang's heartbeat was a while, Du Xue is the kind of girl who becomes more and more beautiful the more she looks, and it is easy for people to have a protective psychology when she is soft and weak, in fact, when she is on the train, Zhang Yang's sudden burst of courage is also related to Du Xue's weak temperament, in the heart of every man, there will be a subconscious to protect the weak machismo...... [Recommended votes are not fierce]