When Lao Lin returned home after class, Lin Chaoxi had been sitting in the yard for a long time. Although he had lit a mosquito coil, he still had many mosquito bites on his legs.
In the yard, smoke was curling up. Lao Lin was pushing his bicycle, very surprised: "What's going on? Are you bathing and burning incense to get ready to become a monk?"
"Do you know what happened in Pei's house?" Lin Chaoxi looked up and asked.
"What's the matter?" Lao Lin parked his bike, took down the midnight snack hanging on the faucet, and put it on the stone table in front of her.
There were two servings of grilled cold noodles. Lin Chaoxi broke open the disposable chopsticks and poked them.
"I went to the hospital today to get an injection..."
"Fighting again? Your parents took you to get a shot, you're doing pretty well." Lao Lin interrupted him.
Lin Zhaoxi: "What do you mean by 'again'? And what's the matter with you asking Pei Zhi to hold a parents' meeting for me?"
"Can't we find something for him to do?" Lao Lin opened the lid of the cold noodles. "While he's getting the injection at the hospital, what's next?"
"I saw him talking to the oncologist."
"Oh, his mother is in the advanced stage of breast cancer." Lao Lin said calmly.
Lin Zhaoxi raised his head suddenly: "You know?"
In Gao Lin Chaoxi's memory, there was no accurate information about Pei Zhi, and Old Lin never told her.
"Yes, I know that you are the only one who doesn't care about my eldest disciple."
Lin Chaoxi recalled what he was doing during the period before and after school started, and was speechless.
"I'm sorry," she said.
"Okay, Pei Zhi probably doesn't want you to sympathize with him too much. Boys have strange self-esteem. They would rather help you, but they may not be willing to accept your help."
"So you want him to be my parent?"
"No, let him be your parent because..."
Lin Chaoxi listened carefully, but saw Lao Lin suddenly knock on her lunch box, and when she was not paying attention, he directly picked up the grilled tenderloin inside.
"I was wondering why there is nothing in mine, but here it is in yours." He muttered.
"dad!"
"Because you're more fun." Lao Lin said, "You'll jump up and down if you tease me."
Lin Chaoxi stared at Lao Lin. She always felt that Lao Lin meant that her thing was more interesting, and she lent it to Pei Zhi because Pei Zhi was in a bad mood.
She glared at Lao Lin, but Lao Lin lowered his head. The only sound in the yard was the sound of Lao Lin slurping his cold noodles.
Lin Chaoxi thought that what Old Lin said was actually not wrong. For someone like Pei Zhi, it would be better to make him feel needed than to make him feel helped.
His family problems were irreconcilable and unresolvable, and there was nothing they could do except stay with him.
Lin Chaoxi looked at Lao Lin's head and called softly, "Dad."
Old Lin looked up, and Lin Chaoxi took all the crab sticks from his bowl and stuffed his mouth full. He chewed and said, "When you're working on that graph isomorphism, bring Pei Zhi over too. Let's find something for him to do. After all, he's a once-in-a-century genius."
Lao Lin: “Not a hundred years.”
"ah?"
"After all, so am I. We are not that different."
Lin Zhaoxi: “…”
——
That night, Lin Chaoxi took Lao Lin with him for the first time and wanted to study with him.
There are still 100 days until she leaves this world.
Within these 100 days, Lao Lin not only had to complete the entire erroneous argument, but also had to overturn his own argument and make a completely new discovery based on it.
Even if she had all of the research results of Lao Lin from Strawberry World, she couldn't just copy them down and give them to Lao Lin.
What should she do? She must stay by Lao Lin's side, test the rules of the world, and find the right way, just like solving a problem.
Old Lin had no objection to her following him, and that night, Lin Chaoxi moved her homework into Old Lin's study.
However, Comrade Lao Lin expressed doubts about her professionalism: "How many pages of graph theory have you read?"
Lin Chaoxi stood up, walked to Lao Lin's bookshelf, pulled out the first edition of "Graph Theory and Its Applications", and said, "I've finished reading it."
"Wow, that's great." Comrade Lao Lin gave her a thumbs up. "Where are the exercises at the end of the book?"
"It's only half done. There are many things I don't understand."
"Then let Daddy tell you something?"
"No, you go ahead and do your thing. I have to learn what I don't know by myself. You can teach me when you are free." Lin Chaoxi refused bluntly and sat at his small table with a book in his arms.
If you search for graph theory on Baidu Encyclopedia, the first sentence is probably like this:
——As we all know, graph theory originated from a very classic problem, the Konigsberg problem.
The word Königsberg is certainly not so "well-known", but if it is replaced by its other translation - the Seven Bridges Problem, it becomes a content that many students have come into contact with in elementary school mathematics Olympiad.
It usually appears in the "Little Knowledge" column of elementary school Olympiad mathematics books. The accompanying picture shows two places A and B separated by a river. There are two small islands C and D on the river, and there are 7 bridges connecting the islands with the mainland.
The question is as follows: How can a person start from any of a, b, c, or d, cross each bridge exactly once, and return to the starting point?
Many people tried it and found that it seemed impossible to do it. But this is mathematics, whether it is possible or not, it needs to be proven.
Thus, graph theory was born.
In 1736, Euler submitted his paper "Seven Bridges of Königsberg" to the St. Petersburg Academy of Sciences. He abstracted the island and the river bank into vertices, and the bridges became the edges connecting the vertices, proving that it is impossible to walk all seven bridges at once without repeating.
While completing the solution, Euler created a new branch of mathematics - graph theory and geometric topology.
This is mathematics. You never know what kind of future lies behind solving a seemingly meaningless problem.
Lin Chaoxi finished reading another chapter and felt emotional.
In fact, she knew very well that she could not help much in this deeper field, but for her, her fate seemed to be involuntarily entangled with this problem.
Knowing more and understanding more deeply may be helpful to Lao Lin at some point.
Comrade Lao Lin was still concentrating on his work at the desk, quietly doing his own calculations.
This evening's study...
Lin Chaoxi did not provide any help to Lao Lin. Not only that, Lao Lin also looked at her exercise book and took the time to give her a proof.
They talked about the Seven Bridges Problem for a while. Lao Lin said that it was a good opportunity because his elementary school Olympiad class was about to cover this topic, so he asked her to talk about it to the children on the weekend.
So Lin Chaoxi inexplicably began to think about how to teach this class.
In the middle of the night, Lin Zhaoxi lay on the bed, looking at the mosquito net.
In the darkness, she tried hard to make herself think again about the problems in Lao Lin's proof and the few lines of draft in which he made new breakthroughs. She couldn't copy down what was in her mind, so she could only do this, like an ant moving a mountain.
Force yourself to understand and not forget.
Just before falling asleep, she crossed out the first of the 100 days on the timetable in her mind.
——
Anning Experimental High School is the best school in the entire city of Anning. The daily workload is heavy. Students must arrive at school at 7 a.m. and have evening self-study until 9 p.m.
Lao Lin was more open-minded and let her study in the evening as she pleased. Her homeroom teacher, Ms. Mei, also made an exception for her because she had to participate in a math competition training session.
So, she became the most special person in the class.
Lin Chaoxi and Lu Zhihao were sitting in the school's Mathematical Olympiad intensive training class at six o'clock in the afternoon.
Just like in junior high school, she and Comrade Lao Lu had little affinity, and they were not in the same class. Not only that, Comrade Lu Zhihao, Pei Zhi, Hua Juan, Chen Chengcheng and even Comrade Zhang Liang were all in Class 2.
Hanamaki is already a well-known artist and is very busy with her schedule, so she will not participate in the competition again.
"I heard that you had a fight again yesterday?" Lu Zhihao looked up and asked when he saw her sitting down.
"What do you mean by 'again'..." Lin Zhaoxi took out her exercise book. Pei Zhi hadn't come yet. Lu Zhihao, a high school student, was a big man. She felt a little crowded sitting next to him and was not used to it.
"The gangsters in Class 8 threatened to get you, but you acted like nothing happened."
Lin Chaoxi really didn't take it seriously: "We are a prestigious school, and the little hooligans just do whatever they want to do to me. Where is the face of the school?"
"Anyway, I just heard it. You should stay out of trouble. There are bullies in our school who like to bully others. Be careful or you will get sacked."
"No." Lin Chaoxi was quite sure, and briefly told Lu Zhihao how he handled yesterday's incident.
"Is Pei Zhi here to help you clean up your messy stall?" This was Lu Zhihao's first sentence.
"You used the adjective inappropriately. Change it quickly." Lin Chaoxi criticized.
"Then it shouldn't be a big deal." Comrade Lao Lu changed the subject, as if the two words "Pei Zhi" were the best guarantee, "But, have you ever thought about it, although those people can guarantee that they will bully others, what if they find someone else?"
"..." Lin Zhaoxi, "What you said makes sense, but we can only do so much."
"Okay, I'm just reminding you. And I think that with Pei Zhi here, you should have scared them. You probably feel embarrassed to say such harsh words."
"Hmm..." Lin Chaoxi opened the competition book and exercise book.
Gao Lin Chaoxi was indeed very serious. She did all the questions neatly and even asked questions that required people to apply what they had learned to other situations. Sometimes, when she was in a good mood, she would even make up her own questions. These were habits she developed in the training team.
Lin Chaoxi watched for a while, and then the teacher walked into the classroom and was about to start the class.
The students in the rows in front and behind them also took their seats.
Only then did Lin Chaoxi realize that Pei Zhi had not arrived yet.
"Isn't Brother Pei coming?" She looked around, but there seemed to be no such information in her memory.
"He hasn't come for a long time. The questions in our competition must be too easy for him." Lu Zhihao looked at him strangely.
"oh."
The bell rang, and the teacher walked up to the podium and wrote a line on the blackboard: "Hello, students. Today we are going to learn the third lecture of High School Mathematical Olympiad - Graph Theory Problems."
Lin Zhaoxi looked at the chalk writing on the blackboard, and what Pei Zhi had said on the phone at that time came to his mind - when she was sick, she asked me to never touch mathematics again, and I agreed. After she passed away, the promise I made to her brought me great psychological pressure and made me very painful.
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