He Tiantian walked neatly and quietly, without any farewell ceremony.

On Monday morning, the classmates noticed that He Tiantian was absent, and initially thought that he was sick or on personal leave. Then in the Chinese class, Zhu Qingjia said lightly: "He Tiantian has been transferred to other schools since last week due to family reasons. At this point, it marks the complete conclusion of He Tiantian's study and life in Huai'an Mansion.

Regarding He Tiantian's low-key departure, most of the classmates thought that he lost to Jiang Shuiyuan in the class president election, and felt shameless to see Jiangdong's father again, and finally chose to escape. But Wu Zichen, who knew the truth best, was silent about it, and even deliberately cited the speculation of his classmates to mislead Jiang Shuiyuan, and the director Jiang Shuiyuan also believed that He Tiantian was Xiang Yu in the first (second) class of high school, and he transferred to another school if he was unsuccessful, and he gave a thumbs up to his backbone in his heart.

As the days passed, the heavy schoolwork came with the momentum of dark clouds, and the activities organized by various clubs in the school came one after another, and everyone soon devoted themselves to studying and club activities, but after three or five days of work, they forgot that there was a classmate named He Tiantian in the class! After these days of hard work, Zhang Jin of the first (eleventh) class of high school finally previewed mathematics to Cheng Dù in the first semester of the second year of high school, and stumbled to completely solve the problem of washing clothes.

It is said that Ge Juntian finished assigning the topic, and when he returned to the teaching and research group, he found that this topic needed to use the knowledge points of the second year of high school, and he wanted to change the question for them. What's more, the two of them are their own protégés, and they are going to win the gold medal in the International Mathematical Olympiad in the future.

More than a week has passed in the blink of an eye, and the two still haven't come to the door, which makes Ge Juntian a little irritable. At this moment, Zhang Jin knocked on the door of the sophomore mathematics teaching and research group. Seeing that it was Zhang Jin, Ge Juntian was both happy and a little disappointed, but he still asked with a smile: "Zhang Jin, is it difficult to make the question?"

"It's done, it's done, yes, it's a little difficult for me!" After speaking, Zhang Jin respectfully sent the two answers to Ge Juntian, "This, this one is mine, and the other is from the river source!"

Ge Juntian asked casually while reading the answer: "Why didn't that stinky boy from Jiang Shuiyuan come to see me?"

Zhang Jin explained: "Jiang and Jiang Shuiyuan made it early and as early as the evening of the day you took out the question, and then he, he handed me the answer, and, and told me that I wanted to know the 'mean inequality' of the knowledge points in the first semester of the second year of high school. I, I asked him why he didn't just give you the answer, and he said because he wouldn't be participating in the Olympiad math group anymore!"

Ge Juntian flipped through it a little and knew that the answers of the two were correct, especially the proof given by Jiang Shuiyuan, which was standard. But when he heard that Jiang Shuiyuan would not participate in the activities of the math group in the future, he suddenly turned his face: "Why? Did he say why?"

Zhang Jin continued: "It seems that it is because he found that many mathematicians are short-lived, so it's-"

"What kind of bullshit reason is this?" Ge Juntian was dumbfounded, and then said: "I will find him alone in the matter of Jiang Shuiyuan later, but it is very rare that you can study the sophomore high school course by yourself and solve this problem independently." Because self-study is the most effective means of lifelong learning and continuous progress. Next, you can continue to preview the future courses, don't just be satisfied with the level of the second year of high school, and strive to get involved in the content of the third year of high school and even college as soon as possible, and see what you can achieve! In addition, I will give you another question, you go back and think slowly, and see if you can solve it within a week.

"The question is, you must have played Go or backgammon, right? If you take two pieces out of the jar, there are three possibilities, all black, all white, or one black and one white, and according to the probability, the chance of catching all black and all white is one in four, and the chance of one black and one white is one in two. When you catch the same color, you feel like a coincidence. But if you draw three pieces at random, then I can make a bold assertion that there must be two pieces of the same color. As the number increases, chance becomes inevitable, and there is a profound mathematical principle in this!

"The simplest part of the principle that you learned as early as elementary school is called the drawer principle, sometimes also known as the pigeon's nest principle. But as an important principle in combinatorial mathematics, it has a more wonderful use, for example, when you draw 5, 8, 100, 1501 pieces of Go, how many pieces of the same color must be there? The study of mathematics is about discovering profound principles from simple phenomena, and then going back and using profound principles to solve a series of simple or complex problems.

"The Mathematics Olympiad is nothing more than a test of your ability in two aspects, one is a comprehensive grasp of knowledge points, and the other is the flexible use of knowledge points. Now you are self-learning the knowledge of the second and third years of high school in order to achieve the first point, and the key is to train the second point well. Today's topic is based on the drawer principle you have learned: if any 6 people are together, 3 of them will know each other or never know each other. ”

Seeing Zhang Jin away, Ge Juntian pinched a little and came to the door of the first (second) class of high school after the bell rang, and directly called Jiang Shuiyuan out.

Although Ge Juntian had seen Jiang Shuiyuan once before, it was at night, and his attention was mainly focused on selecting his protégé, and he didn't pay too much attention to Jiang Shuiyuan's appearance. And this time it was the sunniest time in the golden autumn morning of October, Jiang Shuiyuan was wearing a pale pink T-shirt without any patterns, slightly whitewashed jeans, and light gray canvas shoes on his feet.

Ge Juntian lost his mind for a few seconds, and even a strange thought suddenly appeared in his head: Yes, how can such a young and handsome beautiful boy learn boring mathematics? It is simply a crime against all the girls in the school! A boy like him should go to a literary club, or learn dance and music, and read a little poem written by himself in front of all the students in front of the whole school on a warm spring breeze or a crisp autumn day, or dance a street dance, sing a love song, and let everyone shout wildly, that is the real life!

The wind swept through the hallway, and her shiny, soft black hair fluttered in the wind. Jiang Shuiyuan tilted his head, not knowing whether to avoid the bright sun or the light autumn wind, and then asked, "Teacher Ge, are you looking for me?"

Ge Juntian came back to his senses at this time, and hurriedly said: "I heard Zhang Jin say that you don't want to participate in the activities of the mathematics group of the Olympiad Club in the future?"

"Yes. Jiang Shuiyuan replied simply.

"Why?"

"Because a lot of mathematicians are short-lived!"

"That's it?" Ge Juntian looked at Jiang Yuanyun's indifferent expression, and was so angry that he wanted to go crazy: "What do you say about which mathematicians are short-lived ghosts?"

Jiang Shuiyuan folded his hands and said: "According to the "Biography of the World's Famous Mathematicians" alone, the mathematicians who died before the age of forty included Galois and Pascal of Gaul, Riemann and Hankel of Hans, Ramanujan of Tianzhu, Abel of Wandao, Ramsay of England, and Kovalevskaya of Rakshasa...... In addition, there are many mathematicians who are out of the ordinary, such as Qin Jiushao, a mathematician in the Southern Song Dynasty in China, who is reckless and cruel and unkind, and in the Bernoulli family in Switzerland, the father and son of John and Daniel turned against each other. I think it's better to stay away from math for the sake of my own life!"

Ge Juntian retorted with a sigh: "What you said are all small probability events, and most mathematicians are very long-lived, such as the ancient Greek mathematician Pythagoras is 76 years old, Diophantus is 84 years old, the British mathematician Newton is 85 years old, and the Swiss mathematician Euler is 76 years old. Especially in modern times, many famous mathematicians Shou Yuan are more than 90 years old, or even 100 years old, such as China's great mathematicians Su Buyun and Chen Xingwu, Gaul mathematician Adama, British mathematician Russell, and the United States mathematician Polya, the latter three of whom have lived to be 98 years old! If you don't believe it, you can count the life span of the world's great mathematicians in the past 100 years and see what the results are.

Jiang Shuiyuan muttered: "A small probability event does not mean that it will not happen, once it happens to someone, it will be a living tragedy!"

"Then what do you want? Why don't you die early in the world?" Ge Juntian suddenly became furious, "Sue you, the number of deaths due to work-related injuries in the world every year is more than 1 million, and the number of road traffic accident deaths is also nearly 1 million, so are you not working or walking? In addition, there are 1.8 deaths every second in the world, that is, 106 deaths per minute, 6,360 people in an hour, and 152,640 people in a day, so don't you even want to do it?"

Jiang Shuiyuan tilted his head: "You're right!"

"So you should come back to the math group for me and prepare for the Olympiad!" said Ge Juntian in a fierce voice.