Future library

Liu Bin was a very good drinker. Seeing that the person who refuted Wu Zong was his son-in-law Xin Zha, he couldn't help but become interested. He held the wine cup in his right hand and said, "Jinzhou, can you tell me what the critical wind is?"

"It's calculus, advanced geometry." Cheng Jinzhou raised his sleepy eyes, looked at the eyes around him that were "hungry for knowledge," and said: "As simple as land measurement, no piece of land is really neat and tidy. Yes, how to deal with uneven places is what calculus has to do.”

Wu Zong also drank too much wine, shook his hands and said: "In uneven places, we need to use the techniques of cutting and patching. The mystery of cutting and patching can't be explained even in ten years. "

"Can it not be mysterious? You are using the finite to calculate the infinite." Cheng Jinzhou seemed to have returned to the university in a trance. He seemed to be teaching undergraduates on behalf of an unscrupulous doctoral supervisor, with a silly smile on his face that lured female students: " Really irregular graphics, no matter how you cut them, must be estimated after all. As long as the estimation is wrong, how can you dare to guarantee it? Realistic mathematics can only be precise, not accurate."

Wu Zong was agitated and half awake from the wine. He said in disbelief: "Can you directly calculate irregular shapes without cutting?"

Liu Bin asked vaguely: "What did Mr. Wu mean?"

Wu Zong did not answer, but looked at Cheng Jinzhou intently. Mathematics is a very realistic thing and cannot contain any illusions. Since the latter can understand some cutting-edge problems such as the heptagon, he is naturally not a fool.

What's more, he was recognized by Liu Kuang, a fourth-level star warlock.

With Cheng's physical condition, he could get drunk after just a few glasses of wine. However, he vomited for a while and sobered up for a while, which only made Cheng Jinzhou slur his tongue and talk nonsense: "Measuring irregular shapes is a matter of fractal geometry." , It has nothing to do with me, but if it’s about measuring land or something, I can still use calculus casually.”

As he spoke, he dipped his hand in wine and began to draw twisted pictures on the tablecloth.

The star warlock worshiped by the Cheng family was somewhat interested, and several nobles with higher status crowded together.

Cheng Jinzhou casually drew the simplest wave curve, which is the first graph in any calculus textbook, and muttered: "As long as you think of a curve as a collection of many points, that graph will not matter. Can you accurately measure it? How fine your points are, how high your accuracy will be, until you are exhausted."

No idea appears suddenly. The core concept of calculus is "limit", which was perfected by Cauchy in the 19th century. Limits can be traced back to the "poor method" of Greece in the 5th century BC. Wu Zong could never understand the formula used by Cheng Jinzhou, but he could quickly understand the other party's thoughts.

Some of the rice wine had evaporated long ago and I don't know where it went. Wu Zong also reached out to dip his hand in the wine. Ignoring the vegetable soup on his sleeves, he drew two simple irregular shapes and said: "If you apply your method to Here, we calculate the results..."

"Can calculus still be proven by trial or enumeration?" Cheng Jinzhou looked down at Wu Zong with drunken eyes. Even so, he still gave the answer.

Nature is undoubtedly correct.

"My mind is unclear, my fault." Wu Zong's lips became dry, and he didn't even care about his beard curling up. After admitting his mistake, he immediately said: "How did you get this formula?"

"This is called derivation, and it's not a formula." Cheng Jinzhou wiped his hands with a tablecloth and said, "The process is very cumbersome, and I'm too lazy to write it down."

There is indeed a lot of content, but the main reason is that Cheng Jinzhou cannot remember it all.

Wu Zongnuo was embarrassed to speak, but Liu Bin next to him smoothed things over and said, "Mr. Wu, you have to tell us what kind of riddle you are playing."

At this time, it was Wu Zong's turn to be impatient. Just because of the identity of the other count, he suppressed his temper and said: "Whether it is a river beach or a forest, it is never a regular shape. This cutting and repairing technique is to see if there is an extra piece. When it comes down, there is a missing piece. Cutting and patching will always make a difference. No matter how good the star warlock is, it is impossible to cut and patch up the balance. It is enough for normal use, but Cheng... …If Mr. Cheng’s method is correct, it can be used not only for land measurement.”

A group of people were amazed. When it comes to the status of calculus in mathematics, it cannot be said enough, but for these nobles, a little bit of real and simple meaning is more likely to arouse appreciation.

Cheng Jinhao looked behind him with lingering fear. The ladies and ladies had long been suffocated by the smell of deep processing, but he didn't see Cheng Jinzhou's performance at all.

Thinking that Liu Qingshuang only saw Cheng Jinzhou's ugly appearance, Cheng Jinhao felt a little spiritually happy - even if there were gossips spreading it around, the taste was completely different from what he saw on the spot.

The star warlocks looked at Cheng Jinzhou with eager eyes, like a fat man who was losing weight, his eyes were bloodshot when he saw meat, and he almost waved his knife and fork.

Cheng Jinzhou vomited for a long time, and with the enthusiasm of waving his wine hand, his mind came to his senses. He looked at the standard calculus graphics on the tablecloth, and the remaining alcohol was evaporated by cold sweat. He was not willing to talk nonsense with them at this time. Ignoring the dishes and basins on the table, I grabbed the tablecloth, tore it up, rolled it up, and left.

Everyone looked at him and inadvertently moved out of the way - a capable star warlock was always the most popular person on the planet.

Only Liu Bin chuckled and touched his beard, admiring himself in his heart. When Cheng Jinzhou was about to walk out, he waved and shouted: "Uncle, remember to come and chat with the old man tomorrow."

The figure turned the corner, and he was still there waving.

The banquet ended naturally. The process was dramatic and the result was wonderful. The guests and hosts enjoyed themselves, even a little too much. Liu Bin returned to his residence, still stroking his beard and laughing.

Mrs. Liu, who came back first, was a little unhappy. While instructing the girl to wash the master's face and change clothes, she said half-complainingly: "How could you promise the marriage like that and not discuss it at home? I saw Cheng Jinzhou and heard that It used to be a medicine jar, but now it is better, and it is too late to enter school..."

The ladies of the Great Xia Dynasty still had quite a certain status, which was a bit like France during the Louis XIV period. Mrs. Liu kept her hands on her and kept saying bad things about Cheng Jinzhou.

Liu Bin just smiled. After removing the hot towel from his face, he breathed a sigh of relief, tilted his head and asked, "Shuang'er, what do you think?"

Liu Qingshuang shook her head slightly and said: "Shuang'er just doesn't understand why dad values ​​him."

She counterattacked in a roundabout way.

"This is a good response, worthy of that boy." Liu Bin commented first, and then said with a hearty smile: "That boy is not simple, but his body is indeed a little weaker. Well... let's take Meng Da and Meng Er. Give it to him."

Mrs. Liu stopped moving her hands and said in surprise: "They saved your life in Tucheng, and you praised them for their bravery..."

"It takes such a warrior to be worthy of a great star warlock." Liu Bin raised his head slightly and said, "I've always been very accurate in my judgment of people."

…