Chapter 23 Be responsible for Xu Qingzhou
Xu Qingzhou laughed and separated from Song Yao at the corner of the street.
Song Yao was stunned for a moment, and then realized that she had been teased. At this time, Xu Qingzhou had already walked away, and she could only glare at his back angrily, then turned and walked towards her community.
The Song family's community is similar to Wutong Community, both of which are old communities.
On the way, Song Yao thought clearly that she still had to talk to her father about this matter. People like Li Dingkang were very confused and might cause trouble for Xu Qingzhou.
Although she did not have a close relationship with Xu Qingzhou, she still had to take responsibility for him because of the cause.
When she went back, Zhang Junli was cooking and said, "Your dad called just now and is coming back for dinner tonight."
Just as Song Yao put down her schoolbag, the door opened and Song Shisong came back.
"Captain Song is willing to come back." Zhang Junli teased.
Song Shisong knew that he was in the wrong, so he ran out every day, so he could only laugh and said, "I'm on vacation these two days, and I'll take care of all the work at home."
"Dad, wash your hands and eat." Song Yao helped serve the dishes. Her mother actually understood her father's work, but she always felt that her father was a little too hard-working and didn't take his body seriously, so she wanted to choke every time. .
The family of three was sitting happily at the dinner table.
"I have a meeting in the afternoon. Remember to pay the electricity bill. Do you know where the electricity card is?" Zhang Junli looked at Song Shisong.
"I know, it's in the second drawer."
Song Shisong was attentive and saw that his daughter seemed to be absent-minded, so he couldn't help but ask: "Xiaoyao, what are you thinking about?"
"Someone bullied me." Song Yao put down her chopsticks and said.
The old couple stopped what they were doing, and the living room became quiet.
"Tell me what's going on." Zhang Junli's tone was serious.
"There is a man named Li Dingkang in our school. He was in the same class as me in junior high school. He has been pestering me since he entered high school."
Song Shisong's expression changed, he suppressed his anger and said seriously: "Xiaoyao, why didn't you tell me about such an important thing earlier."
"Dad, Mom, it's not that serious. I can solve these problems myself."
After Song Yao finished speaking, she seemed a little troubled and said, "He just showed up at school with flowers to express his love. Xu Qingzhou came out to help me. I'm afraid Li Dingkang will find someone to take revenge on him."
Hearing the words Xu Qingzhou, Song Shisong's angry mood showed a hint of complexity. His daughter had endured it for so long and suddenly said this because she was worried that Xu Qingzhou would be retaliated against.
Zhang Junli gave Song Yao a piece of ribs and felt a little distressed, "It's okay, Xiaoyao, I'll leave this matter to Dad. If you can't even handle it with a little gangster, why should you be a captain? You can just go back to the countryside and farm."
"Daughter, let dad handle this matter." Song Shisong also said in a deep voice.
"Okay, thank you, dad." Song Yao thinks this matter should be fine.
Sure enough, after dinner, Song Shisong, who had just said he was on vacation, picked up the car keys and said that something happened at the bureau and he wanted to go out.
At noon, after lunch, Xu Qingzhou went to the library to continue reading with his notebook in his arms.
Halmos's "NaiveSetTheory" (Naive Set Theory).
He is currently reading "Research on Methods of Nonlinear Differential Equations", and at the same time, he is also reading Gauss's work on calculus geometry "General Research on Surfaces".
After that, he wanted to extend it a little and try to use nonlinear differential equations to analyze geometric structures. So, he used cases in geometry books to calculate nonlinear calculus equations.
[Surface modeling and reconstruction. 】
First, use nonlinear integral equations to describe the basic geometric properties of the surface. First, express the surface as a function (z=f(x, y)), where ((x, y)) is the coordinate on the surface, (z) is the corresponding height.
A set of discrete data points:
[0.5, 1, 1.5, 2]
Y coordinate: [0, 0, 0, 0, 0]
Z coordinate: [0, 0.4, 0.7, 0.8, 0.9]
Huh~
Xu Qingzhou raised his head, rubbed his temples, and then noticed that Song Yao had sat down opposite him at some point and was doing the questions seriously.
She was wearing a waistcoat skirt today, revealing her small collarbones, her skin was as white as snow, and her long eyelashes were trembling slightly.
Song Yao seemed to realize that Xu Qingzhou had finished, and stopped, pushing the water on her desk in front of Xu Qingzhou.
"Thank you." Xu Qingzhou was not polite, picked up the bottle and took two big gulps.
After drinking the water, my brain became much clearer.
"I want to see what you wrote." Song Yao looked at the draft paper in front of Xu Qingzhou.
Xu Qingzhou handed it over and said, "I just tried to use nonlinear calculus equations to describe the surface structure, and the process went smoothly."
Looking at the densely packed characters on the draft paper, Song Yao couldn't help but feel depressed. She was still studying high school mathematics problems, while others had already started derivation in college.
Alas. Abnormal.
The second model is over, and the entire high school life seems to have been pressed on the accelerator button, and time flies by.
On campus, the atmosphere for the college entrance examination is gradually getting stronger. Everyone seems to have tightened up and started sprinting for the college entrance examination.
The weather is getting hotter and hotter, and there are a lot more students walking on the playground in the evening. Some of them come out to relieve stress. Another group of people feel the atmosphere of separation and simply come for a walk and talk. Some are about to face the breakup season. couple.
The teachers have changed the status of the class. They no longer give instructions as before, eager to stuff all the knowledge into the students' heads. Instead, they start to guide the students' mentality and check for gaps.
In May, the third model is coming.
Xu Qingzhou's score increased by 10 points to 720 points, still ranking first in grade.
The scores of the entire third grade of high school have improved a lot because the questions in this exam are much simpler. To put it bluntly, it is to improve students' confidence in the college entrance examination.
In the classroom, the fan whirred, intertwined with the teachers' lectures.
Time is lost in the heat and noise of summer.
Zhang Yuxin approached Xu Qingzhou three times, but he sternly rejected her every time. After three attempts, the other party seemed to have lost control and suddenly gave up, which surprised Xu Qingzhou.
Thinking that she finally thought about it.
He was not idle and continued to read mathematics books. There was actually only so much undergraduate knowledge.
The first one is high-dimensional nonlinear problems: from the oldest three-body problem, to the NS equations of fluid dynamics, to Einstein's general relativity equations, it involves a wide range of aspects, with rich knowledge content and great difficulty.
Second, the problem of limits: The core content of calculus is limits, and the definition of limits is one of the most difficult things to understand in this course. The definition of limit is specifically divided into the definition of sequence and the definition of function. Because it involves a lot of function content, it is difficult to understand.
The third one is function questions: including elementary function questions, intermediate function questions and advanced function questions, covering a wide range.
Mathematics is an extremely large subject. Not to mention other profound things, even the above three points are enough for most people to spend a lifetime studying.
However, the content he has come across so far is not too difficult for Xu Qingzhou. He has learned it before, but he has not had more in-depth and systematic contact.
(End of chapter)