"Constant mathematics, variable mathematics, contingent mathematics, and fuzzy mathematics, these four kinds of mathematics also correspond to four different forms of civilization. The development of civilization calls for the emergence of corresponding mathematics, and the development of mathematics reflects the times, and sometimes, it also inspires the times. ”

"Constant mathematics, corresponding to classical civilization. ”

"Classical civilization can also be said to be a primitive civilization, a civilization of fire, and a civilization of human and animal power. ”

"Xiao Xu, you young people like to listen to songs, I remember there is a song, the name seems to be called "Once Upon a Time"?

"In the past, the sun became slow, the cars, horses, and mail were slow, and there was only enough time to love one person in a lifetime. Xu Guangling read one of them, and then said: "This is actually a poem, which was composed, but I also paid attention to the words because of the song." Old Chen, do you know this?"

I didn't realize that Mr. Chen likes to listen to songs before.

If he likes it, Xu Guangling can immediately get a sound amplifier system on the mountain, and then the loudspeaker will sound loudly.

However, the audio amplifier system has not been completed, and a music room, including a recording studio, is being built.

After all, music is half of Xu Guangling's profession, of course, it is a bit empty to say this now, with the advancement of the road of the great master, with the contact, study, project establishment and research of medicine, martial arts, food and now the mathematics and other systems, the original music, the weight of the consciousness is getting smaller and smaller.

Xu Guangling doesn't know if he will forget it one day in the future.

But probably not.

For him, music is nostalgia and pastime, which will probably accompany him for the rest of his life.

No matter how far he goes, there will always be times when he doesn't think about anything, doesn't do anything, sits down, and quietly plays a song "Lotus" and a song "No Wind and Rain".

For Xu Guangling, as Mr. Chen said before, this is the origin of his coordinates, at least, one of the components of the origin.

From a song to the person who taught him the song, and then from that person to those two people.

Xu Guangling's thoughts floated lightly, just like this, outside the tent, the white clouds in the distant sky that seemed to be still and fluttering.

The sun is high in the sky, under the blue sky, the white clouds, like scattered quilts spread out to dry in the sun, like big marshmallows, and like the dreams of childhood and youth.

When I woke up, I wasn't a teenager.

No sorrow, no joy, shallow thinking.

Xu Guangling suddenly wanted to drink tea, or just wanted to take a teacup in his hand and turn it slowly.

"When the old man came to look for Old Man Zhang two years ago, he heard it at the train station. Mr. Chen's fingers flicked the few leaves behind the orange stalk.

A generation of large quantities.

If you hear it, you will definitely remember it.

Xu Guangling nodded.

"Once upon a time, the days were slow, and everything was slow. Mr. Chen said lightly, "Slow and simple, this is also the main feature of classical civilization." ”

"Most people work at sunrise and rest at sunset. You can blow the piccolo on the back of the cow, you can take the food to hoe the field, you can knock on the chess pieces and drop the lanterns, or you can come late and want snow, can you drink a cup of nothing?"

"In such an era, mathematics is also in a state of beginning, germination, and initial development. ”

"The times don't need advanced mathematics. ”

"Even if someone conducts advanced mathematical research, or a genius accidentally breaks through the barriers of civilization and touches variable mathematics or even fuzzy mathematics, then the results can only be stopped in the study, then put on the shelf, then scattered, and then forgotten. ”

Or thousands of years later, it was unearthed by later generations, causing a burst of amazement. But that's about it. ”

"Why?"

"Because the times don't need it. ”

"A size 30 foot doesn't need a size 40 shoe, and a size 40 foot doesn't need a size 50 shoe. ”

"No matter how good the shoes are, no matter how beautiful they are, they don't fit, they don't fit, they don't need it, they just don't need it. No matter how beautiful it is, no matter how beautiful it is, it can only be put in a shoebox, put in a corner, and then accumulate dust over time. ”

Xu Guangling nodded.

Bulk is mass.

Even if Mr. Chen is only a major sect in martial arts, a "martial artist", and not a major sect in other aspects, it does not prevent him from standing at the height of the great sect, and then looking at it from the perspective of a generation of great sects, so as to overlook other systems.

Just like that, Wu Zongyu mathematics.

And the reason why it is not a generation of mathematics is probably there is only one reason. That is, "I have an end to my life, and I know no end", and most of his life, most of his energy has been devoted to martial arts.

The silence in other aspects has brought him to the top of the martial arts.

The gains and losses are self-evident.

Martial arts is the foundation of this person. Others, the 100 PhDs and the like, all they represent are landscapes.

If you want to enter the major of mathematics based on this alone, you will not be able to learn from such a teacher, and you will need to learn from other aspects.

But if it's just for getting started, that's enough.

This will also be the best and highest level of introductory teachers in the world, and it is estimated that there will be no ten in the world.

Xu Guangling decided to add two more chicken legs to the old gentleman for dinner today.

Well, there are no chicken thighs yet, so let's have two sweet and sour fish!

"Classical, in such an era, where did the germination of mathematics and people's understanding of mathematics begin?"

"Start with ○. ”

Mr. Chen circled a "○" shape with his thumb and forefinger, "This is zero, and it is also a circle, which is the initial starting point." ”

"The child was just born, and he opened his clear eyes to look at his parents, and in each other's eyes, the dark eyes were round. ”

"The adults go to work in the fields, step on the footsteps of the sun and the moon, rise with the sun, step on the moon and return, the sun and the moon are also round. ”

"In front of the house and behind the house, the tree is round. ”

"The rooster crows in the mulberry tree, and the chicken that takes the tree as its nest lays the chicken (egg) that lays it is also round. ”

"When the harvest is in the field, it is to be pulled back by a cart, and the wheels of the cart are round. ”

"From the circle to the oblate, to the irregular circle, and then in contrast, there is also the concept of 'perfect circle' and 'ellipse'. ”

"When the car is round, it requires a perfect circle, and the more positive the better. ”

"The wheel of the car is composed of a circle on the periphery and a wooden strip as a support in the middle, the circle is required to be round, and the strip is required to be straight. The rounder the better, and the straighter the better. ”

"Then, 'rules' and 'moments' appeared, the rules are in a perfect circle, the moment is square, there are no rules, and there is no square circle. To this day, children learn math, compasses and rulers, and are still essential tools. ”

Then the concepts of radius and diameter, as well as the concept of circumference, came into being. ”

"Then, the 'π' appeared. ”

"Three point, one four, one five, nine hundred and fifty, eight nine seven ninety-three, two three eight four six. Speaking of this, Mr. Chen smiled, "Back then, after opening the top trick for the first time, in order to test his memory, the old man specially found pi to memorize. ”

However, at that time, due to the conditions, I could only find five hundred decimal places, which was not interesting, so later, I still took the whole Tang poem and memorized it. ”

Xu Guangling nodded, "Old Chen, if you want to talk about formal non-learning memory, in fact, I also started with all Tang poems. ”

Saying this, Xu Guangling turned to Mr. Zhang, who was sitting on the side, and said, "Teacher, what about you? By the way, you don't need to say that I can guess that it is related to medicine, 'Four Gentlemen's Tang Zhongyi, Shenshu Poria Cocos Licorice Ratio', right?"

Mr. Zhang nodded with a smile, but said again: "You are only half right. A small thing like a soup song recipe can already be memorized by the teacher when he is a teacher, and he will not forget it. However, after opening the mind, the teacher did review these things comprehensively and systematically. ”

"After the review, the first book that the teacher really memorized was the Neijing. ”

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