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The book Ji Shuijing got this time is a profound mathematical theory, called "Flow Number Method and Infinite Series".

To put it simply, this book is about calculus.

The eighth sister flipped through it casually, feeling that it seemed to be a book related to arithmetic, and said disapprovingly, "It's not difficult, Miss Ben has long been very good at calculating accounts, and she will finish it when she goes back today, and she will continue to hug the third sister tomorrow." ”

Ji Aojian was silent in his heart, Eighth Sister, no matter how powerful the accounting ability you have practiced in business, it is only the realm of four operations, and this mathematical foundation is scum in front of calculus.

Whether it is the geometry that the third sister looked at just now, or the algebra of antiquity and the Middle Ages, it is a kind of constant mathematics, and calculus is the real mathematics of variables, and it is a great revolution in mathematics.

Ji Aojian kindly reminded, "Eighth sister, you can't read this book with your accounting skills. ”

Ji Shuijing smiled, "Little sword, don't you look down on Eighth Sister's skills?"

Ji Ao Kendao, "It's not difficult to settle accounts, it's a person." ”

Ji Shuijing sneered, "Xiao Jian's tone is not small! come, what is four thousand nine hundred and twenty-six plus one thousand six hundred and fifty-seven?"

Ji Ao said, "Wait a minute, I'll find a pen and paper to figure it out." ”

Ji Shuijing looked disdainful, "With paper and pen, you dare to say that you can settle accounts?

Ji Aojian muttered, "How can I do mental arithmetic...... Hey, it's six thousand five hundred and eighty-three. ”

Two four-digit numbers came to mind, and I only felt clear and profound, and the impression was firm, as if it were written on paper.

Only then did he realize that his mind was strong, his mind was tenacious, and the images of things that appeared in his mind were firm and abnormal, difficult to dissipate, and his mental arithmetic ability was naturally far beyond ordinary people.

Now Ji Aojian's short-term memory ability is very strong, and he can forcibly write down dozens of them in one breath by looking at a long series of irregular numbers. Adding four digits is as simple as doing it on a piece of paper.

If you don't have such a powerful memory and calculation ability, how can you calculate the boxing path in the complex move path and reach the realm of order?

Ji Shuijing snorted, and reported a few five-digit and six-digit addition and subtraction. Ji Aojian didn't care, and calculated them one by one, and said in his heart, I can make a draft in my head, even if it is eight figures.

The eighth sister then changed a few multiplication and division problems of thousands of numbers, and although Ji Aojian was a little slower, he also accurately reported the answers.

He added, subtracted, multiplied and divided in his mind, and he was proud, and said, "Eighth sister, this is indeed a very simple thing, right?"

Ji Shuijing sneered again, "Young man, do you think this is the end? There is a square piece of land with a total of 2,25 acres, how long is each side?"

Ji Aojian was stunned, and then protested loudly, "Eighth sister, this is not scientific, why did you even come out of the prescription!

He thought to himself, after all, I am a human brain, not a calculator, so how can I be asked to calculate the length of the sides of a square? This is more than the range of four operations.

Ji Shuijing despised and contempt, squinted, and squinted at various expressions together, "The sale of land and property is the most common thing, and I can't count Fang Tanabe, and I'm embarrassed to say that I can settle accounts?"

Ji Aojian heard her tone like this, and asked carefully, "Eighth sister, can you count?"

Ji Shuijing said proudly, "If you try it, you'll know, see if I can count." ”

Ji Aojian opened his mouth and said some very irregular four-digit numbers, and the eighth sister quickly reported the numbers after the opening, which was faster than his mental arithmetic multiplication and division.

As soon as the numbers in Ji Shuijing's mouth were reported, Ji Aojian multiplied them in his heart to check, and there was no difference between them, although they could not be completely consistent with the original number because they were irrational numbers, but they were the highest precision of the reported numbers.

Ji Aojian was shocked, "Eighth sister, are you a human brain or a computer?"

Ji Shuijing said, "What kind of human brain computer, Fang Tian calculates the side, there is a way, you don't know this way, naturally you won't settle accounts." ”

Ji Aojian thought, what way, did you forcibly memorize all the prescription tables? With your mental ability, maybe it is really possible to do it.

Ji Shuijing said, "Your addition, subtraction, multiplication and division are acceptable, you learned it from the later generations of iQue? ”

Ji Aojian's face turned red, "Eighth sister, teach me." ”

I also want to be a calculator, and this ability must be useful.

Ji Shuijing snorted, "Why do you want to teach you?"

Ji Ao sword said, "Eighth sister, when I give you a sword, you say a word about going up the sword mountain and going down to the sea of fire." ”

Ji Shuijing said, "Yes, I will only give you the sword mountain and the sea of fire, and it has nothing to do with other things." ”

Ji Aojian was helpless, "Okay, then forget it." ”

How could I ask you to go up the sword mountain and go down to the sea of fire, your promise is really not reliable at all, and it is the same as not saying it.

Ji Shuijing chuckled and touched his face, "Talking and playing with you, if you want to learn, I'll teach you." ”

Ji Aojian said happily, "Eighth sister, you are so good. ”

It was really comfortable to be touched again by her soft little hands.

I only heard the eighth sister say again, "The mental arithmetic ability is strong, not only for settling accounts, but also for martial arts cultivation." ”

Ji Aojian thought, I knew that this ability would be very useful, "How will it help?"

Ji Shuijing said with a smile, "Little sword, the superior inner family artistic conception martial arts, broad and profound, mystical and complex, with thousands of moves, infinite changes, people who are not in the mind can not practice at all." For example, the internal martial arts with the Book of Changes as the main source will change from two rituals to four elephants, four images to eight trigrams, eight trigrams to sixty-four hexagrams, sixty-four hexagrams to two hundred and fifty-six hexagrams, and then to four thousand and ninety-six changes, which can be further deduced. ”

Ji Aojian thought, this is the multiplier of two, all the way to the multiplier, the multiplier, the multiplier, the multiplier.

Ji Shuijing said again, "Little sword, you turned over the sword spectrum of the Fuyao Sword, didn't you dare to practice?"

Ji Aojian nodded, when he first looked at the sword book, it was written that the Fuyao Sword Technique was divided into nine layers. There are nine variations in the first layer, eighty-one variations in the second, and seven hundred and twenty-nine variations in the third. And so on, every time the swordsmanship is practiced one layer deeper, there will be nine times more changes, and by the ninth layer, the number of changes will reach an astronomical number.

He was still wondering, this is not a swordsmanship that humans can practice at all. Now I understand that as long as there is the assistance of a powerful mental calculator, the astronomical changes in sword momentum are nothing, and only such a complex and mysterious swordsmanship is worthy of the artistic conception of "soaring up to 90,000 miles".

"Eighth sister, how many levels have you practiced?"

Ji Shuijing said, "It's the fifth layer." ”

On the fifth layer, there are fifty thousand and forty-nine variations in swordsmanship.

Ji Aojian was envious to death, Eighth Sister, what a powerful mind you are, you can control so many changes. "Eighth sister, teach me how to improve mental arithmetic. ”

Ji Shuijing raised the book in his hand, "I'll teach you when I finish reading this book." ”

Ji Aojian's face suddenly became bitter again, that's far away, Eighth Sister, this book is really not something you can understand now.

Even if your mental calculations are comparable to calculators, they are all constant calculations, and this calculus is a category of variable mathematics, not a realm at all.

He sighed and said seriously, "Eighth sister, you take a closer look at a few pages first. ”

Ji Shuijing saw that he looked strict, so he opened it and looked at it attentively. After this look, she frowned more and more, and she was almost screwed together.

After a long time, she stomped her feet with a sad face, "This is simply a book from heaven, the third sister is determined to kill me!"

The founders of calculus were Newton and Leibniz, who independently researched and developed related theories.

Leibniz was one of the greatest semiotics scholars in history, and the calculus symbols he created were far superior to Newton's symbols, which had a great influence on the development of calculus.

And the book "Flow Number Method and Infinite Series" in Ji Shuijing's hand is Newton's work. In other words, there will be no universal symbols of calculus in this book, and it is more obscure to learn than later advanced mathematics textbooks, and it is the original English book, so it is no wonder that she feels like reading a book from heaven.

Ji Aojian hurriedly said, "Eighth sister, there is a way to read this book, if you don't know this method, you will naturally not understand it." ”

Ji Shuijing wondered, "Could it be that you will?"

Ji Aojian nodded hurriedly, "I will." ”

Ji Shuijing didn't believe it, "Your ability to settle accounts is not as good as mine, how can it be?"

"I have a specialization in the art industry, Eighth Sister, just because I can't settle accounts doesn't mean I don't understand this book. ”

Advanced mathematics is a common course in arts and sciences, and Ji Aojian learns it very well.

Ji Shuijing believed it a little, thinking that Xiao Jian would know two hundred years later, he should always have some ability, so he said, "Then you can teach me." ”

Ji Aojian immediately responded, "No problem." ”

Ji Shuijing was a little embarrassed when he saw him so simply, "I can't read this book, so I can't hug the third sister, and if I can't hug the third sister, I won't have the opportunity to understand the way of the grandmaster." Xiaojian, this is very important to me, you have to teach me with your heart. ”

In short, whether you can hug the third sister or not is of great significance, and the eighth sister does not dare to ignore it.

Ji Aojian said solemnly, "I will definitely teach you with my heart." ”

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