The milk tea on the table is steaming, and outside the floor-to-ceiling windows, a few clumps of green bamboo are swaying in the wind.
Lin Zhaoxi stared at the milk tea cup for a while, thinking that the air conditioner in the library might be turned on too much, and she blushed from the heat.
The pause was too long, and Lin Zhaoxi "coughed": "The plot of this movie is roughly like this... In the future, there will be an organization to prevent crimes, which will subvert our present mechanism of punishing crimes that have already occurred..."
"Um."
"This agency uses a number of methods to arrest people who want to commit crimes, but have not yet committed crimes."
"How?"
"Through three 'prophets', um...Three people who can perceive criminal intent, they balabal say a lot of vague things every day...then the crime prevention team can read their 'prophecies' and stop crimes in advance... "
"How much has the crime rate decreased?"
"99.8% reduction in felony crimes., Only 1 murder in five years."
Pei Zhi pondered for a while, and said, "It's really metaphysical."
Lin Zhaoxi didn't know why she suddenly thought of this movie, but since she started talking, she had to continue talking, she swallowed, and asked tentatively: "Then do you think, through mathematical calculations, is it possible to As in the story, figure out when in the future... what will happen?"
Holding up the milk tea, Lin Zhaoxi was waiting for Pei Zhi.
"This is a big proposition." Pei Zhi answered her after thinking seriously.
"Or simplify this question..." Lin Zhaoxi paused, "For example..."
"Like what?"
"Hmm..." Pei Zhi was too smart, Lin Zhaoxi suddenly decided to play tricks, "Why don't you give me an example, I can't think of it."
"For example, there is a criminal, we know that he has the intention to launch a terrorist attack, but we don't know the specifics and location of the attack."
"Hmm, that's it. If you want to use mathematical methods to calculate, what kind of knowledge do you need... start with calculus?"
"The order should be univariate calculus, linear algebra, probability theory, multivariate calculus..." Pei Zhi paused, "But single mathematics, I'm afraid it won't work."
"oh… "
"With computers, there should still be hope."
Lin Zhaoxi's eyes lit up, yes, she seems to have been missing a great tool.
"A date on the first day of the new year?" Suddenly, a long sigh came from behind.
Lin Zhaoxi turned her head abruptly, and Lao Lin stood behind at some point, she was shocked, she really felt like being caught in a puppy love.
"We are discussing some issues." Pei Zhi said calmly.
"what is the problem?"
"You followed me!" Lin Zhaoxi felt guilty and interrupted Pei Zhi and Lao Lin.
"Why did you say that?" Lao Lin laughed.
"You follow me to the library."
"How can the front foot be called the heel?" Lao Lin dragged a chair and sat down at their table casually, "And it's obviously me who made an appointment with Pei Zhixian."
Lin Zhaoxi choked on a sip of milk tea: "Cough!"
Pei Zhi handed over a tissue, and Lin Zhaoxi wiped her mouth: "Did the New Year's Eve secretly start a small stove behind my back?"
"Master..." Pei Zhi said helplessly.
"I called her, and she said something happened, let me play alone." Lao Lin said.
Lin Zhaoxi was stunned, as if for a moment, after she had breakfast with Lao Lin, Lao Lin asked her what plans she had for today, whether she wanted to spend the holiday together...
She said: No, I have something to do...
"Then why did you ask us to come to the library for the holidays?" Lin Zhaoxi asked.
Lao Lin: "By changing the subject so bluntly, Dad really can't answer you for a while."
"..." Lin Zhaoxi, "I'm sorry."
"It doesn't matter."
Lin Zhaoxi: "..."
"I'm here to fulfill your New Year's resolution." Lao Lin said.
Looking at Lao Lin's "father knows everything" face, Lin Zhaoxi's heart skipped a beat nervously, she didn't know what she had exposed.
"What are you saying?"
"Don't you want to listen to your father's teachings during the New Year? Don't you want to learn calculus?" Lao Lin smiled and looked very proud.
Lin Zhaoxi was stunned. She felt that she should be touched. She had asked Lao Lin too many such and other questions before, and Lao Lin took it to heart. Through clues, he discovered her thoughts...
But now, she has a strange sense of fate.
"I will study hard." She said very seriously.
Lao Lin smacked his lips and turned to look at Pei Zhi: "Can you give her some questions?"
Pei Zhi was stunned, not knowing why.
"Make it difficult for her."
Hearing this, Lin Zhaoxi was still dazed. But Pei Zhi understood, he nodded, took out a piece of white paper and pencil from his schoolbag, and really started to write the question.
Lin Chaoxi moved forward in horror, not knowing what Lao Lin and Pei Zhi were doing, so he could only peek at Pei Zhi's classmate posing the question openly and aboveboard.
The first question is factorization, which is very basic. Lin Zhaoxi heaved a sigh of relief after mentally calculating the answer.
The second question is to find the root of the quadratic equation, and the third question is an algebraic proof...
After finishing the part related to algebra, Pei Zhi started to solve function problems, and then geometry, trigonometric functions, compound functions...
Holding a pencil, he wrote steadily and earnestly. Lin Zhaoxi watched helplessly as he finished writing a piece of paper, and then went to get another one, showing no mercy at all.
"Any thoughts?" Lao Lin asked.
"This is… "
"Can you lie to Dad's answer by dragging out the tune?"
Lin Zhaoxi: "..."
"This is the basis?"
"Be more specific." Lao Lin said.
"The basics of middle school mathematics that should be mastered before learning advanced mathematics."
"Although you learned mathematics in middle school, and college mathematics..."
"Basically it doesn't matter." Lin Zhaoxi added, "I will still answer the question bravely."
"But?" Lao Lin was about to start turning a corner.
"But you have to know clearly why there is no relationship between them."
Pei Zhi raised the corner of his mouth with difficulty, probably because he felt that her answer was very Lao Lin's style.
Lao Lin nodded lightly and asked Pei Zhi to bring the topic.
It was only then that Lin Zhaoxi realized that Pei Zhi had written a whole three-page title without realizing it.
There are proofs and analysis, and a very complicated function problem...
"This question is quite interesting." Pei Zhi explained.
Lin Zhaoxi: "..."
Being stared at by two people on the left and right, Lin Zhaoxi didn't even have the strength to resist.
The New Year's date is just a question, she actually felt that it was normal, so she picked up the pencil in front of Pei Zhi, and said, "Give me some more blank paper."
—
For two full hours, nestled in the small sofa in the small coffee shop, Lin Zhaoxi wrote non-stop.
The questions given by Pei Zhi, like him, are very regular and orderly, but also very deep. Some seemingly simple proof questions actually involve a lot of knowledge application, and she also needs to think carefully.
Before she knew it, time passed by, and Lin Zhaoxi was immersed in it. The moment she put down her pen, she let out a long breath, thinking that the college entrance examination might be nothing more than that.
She began to organize the answer sheets on the glass table, flipped through them from beginning to end, and then prepared to hand in the papers.
Lao Lin said: "Keep it for yourself, it's time for dinner, let's go eat."
After finishing speaking, Lao Lin took the lead, pushed away the chair and ran away.
Lin Zhaoxi asked Pei Zhi in a low voice: "What's the matter, master, can you approve it for me?" She was going to hand in the answer sheet sincerely, waiting for the inspection.
"While you were doing it, Master was watching."
"... so no problem?"
"Um."
"Then why is he running?"
Pei Zhi continued helplessly: "I want to go to the bathroom."
Lin Zhaoxi: "?"
Pei Zhi started to pack his things. The heating in the small coffee shop was very good. Lin Zhaoxi looked at the table, reacted for a while, and finally understood: she was immersed in doing the questions just now, but Lao Lin had been watching her nervously. How long have you been waiting.
Perhaps for Lao Lin, this is the test he likes the most. It is a big test of all middle school mathematics knowledge, and it is especially important when coupled with the meaning of the new year and new weather.
"I didn't say it earlier!" Lin Zhaoxi rubbed her face. It's scary that her father likes to make such a surprise attack. She is glad that she did the problem seriously just now.
"Master said..."
"say what?"
"I'm afraid that if you knew it earlier, you would come to lie about the title..."
"Why am I this kind of person?!" There was still a large cup of milk tea that Pei Zhi ordered, Lin Zhaoxi picked it up very distressed, and wanted to drink two more sips before leaving.
"It's cold, don't drink it." Pei Zhi said.