Everything about U City University of Technology surprised Song Huiqin. The school covers an area of more than 2,000 acres, which is much larger than the high school she attended. The dormitory, the classroom, and the cafeteria, these are the three places she is most familiar with, and she goes back and forth between these three places every day. Song Huiqin found that college was much more free than high school, and many things were different from high school. One is that you don't need to study in the morning in college. You can sleep in the morning, or you can get up early to the school lake to read early, it's not mandatory, it's all up to you. When she was in high school at S County No. 1 Middle School, urban students went to school, and rural students had to live on campus, get up on time every day, do exercises, and read early. The second is that they don't have a fixed classroom. "Advanced Mathematics", "Introduction to Mao Zedong Thought" and other public elective courses, all grades of the school choose courses together, take classes together, and the classrooms for each class every week are not fixed. There are no fixed seats in the classroom, you can sit in the front, in the back, on the left and on the right. Empty seats can be left between seats. Those who have not chosen a course can come in to audit, and those who have taken a course can also skip class. This is unthinkable in S County No. 1 Middle School. In S County No. 1 Middle School, each student has a fixed seat, and the teacher keeps an eye on you every day, and if you dare to be late and absent from class, you will be punished. Who cares about you now? You have to take care of yourself. Song Huiqin also found differences in all aspects, and she had to adapt slowly.

Song Huiqin likes "Advanced Mathematics" very much, and she finds that many high school math problems are easy to solve using advanced mathematics methods. In other words, "you can use a knife to kill a chicken". Why didn't she think about it then? She took Professor He's "Advanced Mathematics" course. Mr. He, who has been teaching advanced mathematics for decades, is very popular with students, and the number of students who choose courses is full. Despite this, some leaders are dissatisfied with Professor He, saying that he only engages in teaching, and does not go out to get projects, and teaching without scientific research projects is to eat the old book, and there will always be a day when he finishes eating, and he cannot keep up with the rapid development of the scientific and technological era. Song Huiqin had to go to the classroom every day to occupy a seat, and some students took up their seats the night before.

When Song Huiqin was on "Advanced Mathematics", he met Wu Linfeng, a student majoring in economic management, who was tall, white, sunny and handsome. At that time, Wu Linfeng was sitting on her left, and when she was looking at the blackboard, she happened to see the outline of Song Huiqin's left face and found that she was very beautiful. At that time, Professor He was lecturing on two important limits in advanced mathematics, one was the sine of x divided by x, and when x approached infinity, the limit was equal to 1; The other is (1+1/x) to the power of x, and when x approaches infinity, the limit is equal to the natural constant e. Wu Linfeng approached her by borrowing notes and asking questions.

After class, Wu Linfeng has been paying attention to Song Huiqin's whereabouts. He found Song Huiqin pacing slowly by the back door of the classroom, he stepped forward and accosted: "Classmate, I heard that you are a member of the study committee of Class 1 of the Applied Physics major, and your academic performance is very good. I'm struggling to study advanced mathematics, so please help me a little bit in the future! ”

"How do you know I'm a study councilor?" Song Huiqin asked.

"I saw you in the first two classes. I know your classmates, they told me. ”

"So you had a premeditated plan." Song Huiqin said.

"You're studying so hard that it's hard to sit in the front row every time, and it's hard not to notice you." Wu Linfeng said.

"Can you keep up with what you're learning today?" Song Huiqin asked.

"The concept of limits that Professor He talked about today is really difficult to understand!" Wu Linfeng said.

"Where is it so hard? You're deserting in class! ”

"I have a question about the limits in high numbers, and I just want to ask you." Wu Linfeng asked Song Huiqin to stand up, came behind her, and said, "Stand up, I'm here!" ”

"What are you going to do?"

"I'll see if I can catch up with you." Wu Linfeng said.

"You...... What do you mean? This kind of thing is no joke. ”

"Well, I'm thinking about the concept of limits. Suppose I'm coming from here, and I'm coming to you, and I'm going to go to the midpoint of our line first; I'm going to get to you, and I'm going to get to you, and I'm going to get to the midpoint of our connection; I keep walking, and every time I go, I have to go through the midpoint of our connection, and there are infinitely many of them, so I'll never get to you. Wu Linfeng blinked his cunning eyes, he seemed to be humbly asking for advice, and he seemed to be selling off his profound knowledge like a philosopher.

"That makes sense, but you only need to take a few steps and you're coming!" Song Huiqin said.

"But by the definition of the limit, I will never get to you. Or rather, it will take me an infinite amount of time to get to you. A simple and intuitive question was made like this by Wu Linfeng, he really moaned without illness, and made simple questions very complicated, it is said that many scholars are like this.

The class bell rang. Song Huiqin said: "I can't figure it out either, let's ask Professor He after class later." Later, Professor He explained to them from both mathematical and philosophical aspects. They listened speciously, but they still didn't understand.

"Don't ask for a solution! As long as you can do the questions, you can get a high score in the exam! Song Huiqin said to Wu Linfeng.

Later, when he took advanced mathematics classes, Wu Linfeng would always give Song Huiqin a seat. A student asked Wu Linfeng: "Classmate, is there anyone in this position?" ”

"There's already someone in this position."

Song Huiqin knew that this was the position left for her by Wu Linfeng. If she finds a place on her own, she doesn't sit down. When Wu Linfeng saw her sit down, he would take away the book that occupied the seat and give up the place to someone else. Once, Song Huiqin was late and didn't find a place by himself, so he sat next to Wu Linfeng.

In addition to "Advanced Mathematics", they are also together on "Introduction to Mao Zedong's Thought". Originally, Wu Linfeng chose another class, but later he inquired about Song Huiqin's class and turned around. For the first two weeks of each course, students can attend the class at will, change the teacher at will, and after two weeks, once selected, they cannot change it.

They learned the "Analysis of the Classes in Chinese Society". In this work, it is written: "The so-called semi-proletariat consists of: (1) the vast majority of semi-yeoman peasants, (2) poor peasants, (3) small handicraftsmen, (4) shop assistants, (5) hawkers, and so on. The vast majority of semi-yeoman peasants and poor peasants are a very large number of people in the countryside. The so-called peasant problem is mainly their problem. Semi-subsistence peasants, poor peasants, and small craftsmen run an economy of smaller, smaller-producing production. Although the vast majority of semi-yeoman peasants and poor peasants belong to the semi-proletariat, their economic conditions are still divided into three parts: upper, middle, and lower. Semi-yeoman peasants live in hardship from yeoman peasants, because they do not have enough food for about half of their food every year, so they have to rent other people's land, or sell part of their labor, or run small businesses to make up for it. In the spring and summer, the green and yellow are not connected, and the usury borrows from others, and buys grain from others at a heavy price, which is more difficult than the self-cultivated peasants, but better than the poor peasants. Because the poor peasants have no land, they have only half or less of the harvest they harvest each year; Semi-yeoman farmers rent only half or less of what they have from others, but they get all of their own. Therefore, the revolutionary nature of the semi-yeoman peasant is better than that of the yeoman peasant but not that of the poor peasantry. The poor peasants were tenant farmers in the countryside and were exploited by the landlords. Its economic status is divided into two parts. Some poor peasants have relatively sufficient agricultural tools and a considerable amount of funds. Such peasants can get half of the fruits of their labor each year. The insufficient part can be planted with miscellaneous grains, fish and shrimp, raised chickens and pigs, or sold a part of the labor force to barely make ends meet. Therefore, their life is more difficult than that of semi-subsistence peasants, but they are better off than other poor peasants. It is more revolutionary than the semi-yeoman peasants and inferior to the other part of the poor peasants. The so-called poor peasants have neither sufficient agricultural tools nor funds, insufficient fertilizer, poor land harvest, and little income except for rent, and even more need to sell part of their labor. In the famine and the violent month, he begged for mercy from relatives and friends, borrowed a few buckets and a few liters, perfunctory for three days and five days, and the debts were clustered, like a cow carrying a weight. They were the hardest of the peasants and were very receptive to revolutionary propaganda......"

After finishing "Introduction to Mao Zedong's Thought" in the morning one or two sessions, there will be no classes in the morning. It's still early for lunch, and there's nothing else to do. Wu Linfeng invited Song Huiqin to Starbucks. Song Huiqin said: "What is Starbucks? ”

"I'm going to have you coffee."

"We have just finished studying "Analysis of the Classes in Chinese Society", and I am a semi-proletarian in it, and it belongs to the poor peasant families in it. I can't afford coffee! It seems that you are a petty bourgeoisie, and only petty bourgeoisie goes to drink coffee. I just drink plain water every day, and I don't need to drink tea. Song Huiqin said.

Wu Linfeng sincerely invited Song Huiqin to drink coffee, but she didn't expect her to use Mao Zhuxi's social class theory to contradict her, which was really boring. Saying goodbye to Wu Linfeng, Song Huiqin returned to the bedroom.