Pei Zhi's voice on the phone seemed to echo in Lin Chaoxi's ears again.
She began to worry again.
It was Friday, and the next day was the weekend. According to the agreement between Lao Lin and Pei Zhi, Pei Zhi would come to the Red Star Welfare House all day on the weekend. And she would start her first class as an Olympiad math teacher.
Saturday, 7:00am.
Lin Chaoxi and Lao Lin sat opposite each other in his office at the Red Star Welfare Home, each chewing on a fried dough stick.
Lin Chaoxi drank a sip of soy milk and saw the clock strike 7. He subconsciously looked towards the door, worried that just like the Olympiad math classes at school, Pei Zhi would no longer come to the Red Star Welfare Home.
"Student Lin Chaoxi." Old Lin spoke.
"ah?"
"What have you done wrong?" Old Lin took a sip of soy milk carefully and suddenly asked.
"I am a good student, what could I possibly do wrong?"
"I told you, I kept a student here two days ago, and he was playing chess in my class. Your face now brings back my memory."
"What memory?"
"What does a child's face look like when he is waiting for his parents?"
Lin Chaoxi was still looking at the door, wondering why Old Lin suddenly asked the child to stay and call his parents. Then he realized what he was talking about.
"Hey!" she turned around and shouted.
Lao Lin looked at the door and said, "Here they come."
Lin Zhaoxi knew that Lao Lin was teasing her again: "I told you about Comrade Lao Lin, do you think I would believe it?"
"What do you believe?" Pei Zhi's voice rang out.
Lin Zhaoxi jumped up: "You're here, so, so early!"
Pei Zhi stood at the door, looking relaxed. He was still wearing his school uniform, with sweat on his forehead, and was panting slightly, as if he had just run.
"Good morning." Pei Zhi greeted them and walked in.
Lin Chaoxi then noticed that he was holding two plastic bags, which contained her and Lao Lin's favorite egg pancakes.
Pei Zhi also noticed the leftover soy milk and fried dough sticks on their table, but he put them down anyway: "Can you eat more?" he asked.
Lin Chaoxi and Lao Lin nodded vigorously at the same time.
——
Pei Zhi's arrival makes the whole morning "classroom" full of vitality.
Although Lin Chaoxi always believed that vitality was her responsibility, she had to admit that when Pei Zhi sat down in this small office, although the atmosphere was peaceful, the learning atmosphere became strong.
"I have an idea. I wonder if you are interested in participating." Lao Lin took a bite of the pancake with two eggs in it and said this with satisfaction.
"have."
Pei Zhi didn't ask what he thought and said "yes" directly. Lao Lin took a sip of soy milk and said, "Then check these and see if there are any problems."
Lao Lin moved a stack of papers from the table and placed it in front of Pei Zhi, also very decisively.
Pei Zhi nodded, thinking that it was Mr. Lin's homework for him to correct. But when he saw the first page, his expression changed for the first time.
That was the draft that Lao Lin wrote yesterday. It was full of "mathematical languages" such as g/h and graph=(v, e). If you have never been exposed to these, you would feel like you were reading a foreign language.
Pei Zhi read a few pages attentively, while Lin Chaoxi held his chin. As a high school student, Pei Zhi looked even more handsome, with a straight nose and a deep and calm look in his eyes.
He obviously understood some of it, and he read it very seriously.
To be honest, generally it is the teachers who check the homework of the students, or the top peers who check the papers of their peers. It is really strange that someone like Lao Lin asked the students to check their own homework.
Pei Zhi looked at it for a long time, and finally said, "There are many things I don't understand."
"If you don't understand, of course you can learn it yourself," said Lao Lin.
Pei Zhi raised his head: "Okay."
Lin Chaoxi thought your conversation was really concise and to the point.
Lao Lin brought a few books over, and Pei Zhi just flipped through them. He was down-to-earth, and when he said he was studying, he would not start reading from a place he didn't understand, but would pick up a pen and start reading from the beginning.
"Dad, can I check you out too?"
Lin Chaoxi's eyes suddenly lit up. Yesterday she was still worrying about how to pass the information to Lao Lin, but now she had a perfect opportunity.
"European clothes are locked." Lao Lin said something in English.
Lin Chaoxi didn't want to joke with him, so he took the stack of drafts that Pei Zhi had translated and started reading them.
In fact, she knew that her current actions were somewhat beyond her capabilities.
Pei Zhi was a genius, and Lao Lin was even better, but she was just a high school student who was good at math. It was ridiculous for her to check Lao Lin's draft.
Fortunately, the people sitting next to her were Lao Lin and Pei Zhi, and they were not the kind of people who would care about these things.
Lin Chaoxi lowered his head, concentrated, and no longer thought about anything else.
The time was from around seven in the morning to nearly eight, and the small office was very quiet.
She had forced herself to memorize a lot of things in Strawberry World. What she had to do now was to find things that were similar to what she had forced herself to memorize, and compare and correct them.
This would not be too difficult for someone with Pei Zhi's excellent memory, or anyone who has a deep understanding of graph isomorphism problems.
But she knew very little about the relevant content, and when she was suddenly faced with complicated proofs, she was confused about what was what.
She could only clumsily, force herself to recall and compare, find the similarities, and then watch them over and over again.
The problem this caused was that she was very slow.
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