Hiding from the bombing until about three o'clock in the afternoon, the teachers and students returned to the school building one after another, and Zhou Hexuan also followed him to find a classroom to observe.

Although the end of the semester is approaching, many teachers still teach as usual, and they don't care about the final exams at all. Especially in the Chinese department, the teachers of each subject are very unparticular about the exam, and they can just hand in an essay at the end of the semester.

It seems that only Zhu Ziqing is the strictest in the entire Chinese department, requiring students to take notes in class, and to take the exam seriously at the end of the semester.

Of course, the departments of science and engineering, medicine, and law are still very strict, and a group cheating of freshmen was personally ordered and punished by President Mei.

Today, Zhou Hexuan is listening to Jin Yuelin's lecture on logic, which is a compulsory course in the Faculty of Arts, just like the high mathematics of science departments, which can make students want to die.

Jin Yuelin is tall and strong, wearing the only jacket in the entire school, and if it is winter, he will wear a windbreaker, which is absolutely stylish. Unfortunately, his hat and glasses ruined the overall image, and the brim was pressed low, covering his entire forehead. The glasses are even more strange, one lens is white and transparent, and the other lens is black sunglasses, as if the sunglasses will lift the seal of the writing wheel.

This is not a special fetish, hats and sunglasses are used to block the light, because Jin Yuelin has an eye that is afraid of seeing the light.

Jin Yuelin has a bit of a charm of sitting and talking in class, he never stands up to lecture, nor does he look at the students below, he always sits on the podium with his head down, and occasionally stands up when he needs to write a book.

Zhou Hexuan caused a sensation when he entered the classroom, but the sensation soon stopped because Jin Yuelin had already started class.

Jin Yuelin hung his head and said in a magnetic baritone: "Today I will talk about the basic concepts and propositions of the logical system. Let's start with atoms, which are objects in terms of logical systems, not objects in terms of logic. The object of logic is necessity, and the logical system is nothing more than a tool that uses some kind of atom to represent necessity...... First, class. The so-called classes here are ordinary classes, such as humans, mountains, waters, and so on. Classes have the concept of classes, such as the concept that humans have people. Most of the classes have class elements, for example, there are Zhang San and Li Si in human beings...... There are two special classes in the class that makes the atoms of logical systems, one is the zero class and the other is the residual class. There are no members of the zero class, all the members are the members of the whole class. Ordinary uses '0' for zero classes and '1' for all classes. Do you remember the general formula of the system cadre cited in paragraph 3 of section A of the first chapter of this article? Fifth, the basic propositional functions are as follows......"

As he spoke, Jin Yuelin suddenly stood up and wrote a general formula on the blackboard with chalk: (彐z)·(a)·a⊕z=a.

What the heck?

Zhou Hexuan looked a little confused, he didn't understand logic at all, let alone logical symbols and general formulas.

What about the liberal arts, how can it be the same as high mathematics!

Jin Yuelin drew two more intersecting circles, indicating a and z respectively, and said: "z represents the zero class, and this basic proposition is that the zero class or a is equal to the a class, and it also means that the zero class is included in any class. ”

Okay, Zhou Hexuan understands it now, it's a very simple logical question.

People may think that this thing is useless, because it is integrated into the basic human mindset. But in the early days of logic, it was instructive for any science.

A student suddenly raised his hand and said: "Xiansen, for Sen Mo to press to mention the coarse zero class of love, and how to drive a certain four things to be pressed like zero class." Bian Rusuo's 'ghost' is like a zero category, but water can give a ghost to exist? ”

Jin Yuelin seemed to be tested by this question, he thought for a while and said: "Lin Guoda, let me ask you a question: Mr. Lin Guoda is perpendicular to the blackboard, what does this mean?" ”

"Uh......" The Cantonese student named Lin Guoda was speechless for a moment.

The dialogue between the teacher and the student is very interesting, Lin Guoda questioned the correctness of the concept of zero class, and used ghosts as an example to doubt whether there is a real concept of zero class. And Jin Yuelin asked rhetorically: Lin Guoda is perpendicular to the blackboard, what does this mean?

Lin Guoda naturally cannot be perpendicular to the blackboard, which is similar to the concept of zero class, but grammatically and logically, this sentence is not wrong, and there is no way for students to falsify it perpendicular to the blackboard, just as it cannot be proved that ghosts must not exist or exist.

Zhou Hexuan almost laughed out loud, he actually witnessed the famous "Lin Guoda perpendicular to the blackboard" incident.

But Zhou Hexuan couldn't laugh anymore, because Lin Guoda was about to swim and drown.

This Lin Guoda likes to ask questions very much, and always uses the awkward Yuepu to ask some strange questions, which often makes the classmates laugh.

Jin Yuelin obviously liked Lin Guoda very much, until one day, he said in class: "Lin Guoda is dead, very unfortunate." ”

Before he knew it, Zhou Hexuan walked up to Lin Guoda and warned: "Classmate Lin, don't go down to the river to swim, that kind of behavior is very dangerous." ”

Lin Guoda looked confused, and subconsciously agreed: "Ah...... Good. ”

At this moment, a screaming pig suddenly came from outside. Let the students who originally wanted to communicate with Zhou Hexuan run out to see the excitement, Mr. Zhou is not as attractive as the big fat pig.

"Bang Bang!"

Zhou Hexuan clapped his hands and smiled: "Students, today I bought ten big fat pigs, and I eat pork with the teachers at night!" Everyone eats with an open stomach, and there is enough rice! ”

The students were stunned, swallowed their saliva collectively, and then cheered: "Long live Mr. Zhou!" Long live the big fat pig! ”

Jin Yuelin pointed out very seriously: "There is a problem with the logic of what you say, long live Mr. Zhou, long live the big fat pig, then Mr. Zhou may be a big fat pig." ”

"Hahahaha......" the students laughed.

Ten big fat pigs were bought by Sun Yongzhen to the school, which immediately caused a sensation in the whole school, and at least nearly 100 future academicians came to see the pig killing.

The inner and outer three floors were full of people, and many professors came over with small benches, listening to the sound of killing pigs and concentrating on research.

Sun Yongzhen not only brought back ten fat pigs, but also bought several large boxes of cigarettes. Just looking at those cigarette boxes, the smokers who have been out of food for months have green eyes, fantasizing about the fairy days of smoking while eating pork.

"Kill the pig, kill the pig!"

The children of the teacher's family ran all over the place, laughing and playing in groups, and some children ran to ask their parents, "Mom, is it the New Year today?" ”

Zhou Hexuan was also laughing, and the scene in front of him made him very happy, because everyone's joy was so real and pure.

The teachers instructed the students to move all the desks and chairs to the open space, and when it was almost dark, some of the boys appeared carrying wooden barrels. There is only one dish in the bucket, roast pork with kidney beans, and the rest of the pig's blood, pig's large intestine, pig's heart and lungs, etc., will be given to the teachers to take home to improve the food.

Due to the high cost of electricity and the frequent power outages, torches were lit in the open space, and smiling faces were seen in the firelight.

Mei Yiqi came out first to speak: "Teachers, students, Mr. Zhou invites everyone to eat meat today. When you are full of meat, do not forget to study, and do not forget to serve the motherland. Come, let's sing the school song of Southwest Associated University together, and I'll start ......"

The teachers and students sang in unison while looking at the roast pork in the wooden barrel:

"The Long March of thousands of miles resigned from the palace valve of the Five Dynasties.

Temporarily stopped, Hengshan Xiangshui, and parted again.

Absolutely transplant the dry quality, Kyushu is sprinkled with Li Yuan's blood.

Blowing as much as possible, chanting the strings in the mountain city, the love is full!

A thousand years of shame, the end of the snow; Xingye, Xu Renjie.

There are three households in one city, and it is difficult to break strong.

How difficult it is to worry about the new national fortunes, and to be tempted to endure the former philosophy.

To be expelled and restored to Shenjing, return Yanjie! ”