Chinese remainder theorem history
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When she took them out 5 at a time, there were 3 left and when she took them out 7 at a time, there were 2 left. Simply stated: Suppose you wish to find the least number which leaves a remainder of: such that , ,. In the mathematical folklore, I've often heard it associated to the problem of counting the size of an army. Another version which I've heard says that the Chinese Remainder Theorem was used to guard against spies. Is it anything related to Chinese, or Chinese Culture? If you already know it, you can scroll down to the next section. What will the number be? Also, you can share how you feel about learning Chinese Remainder Theorem, let me know you have learnt something because it is the purpose of this article! Although Sun Zi did not provide a complete proof, mathematicians in India, such as , went on to provide a complete algorithm for solving this problem. It follows that: The solution exists if and only if for all where stands for the.

When they lined up 5 in a row, there were 4 soldiers left over. As you can see, there is no reference to counting soldiers here. That book must surely contain something. Patashnik, , 2nd edition, Addison-Wesley, 1994. Matthiessen pointed out the identity of Qin Jiushao's solution with the rule given by C. This situation is characteristic and exemplifies the Chinese Remainder Theorem.

It seems to reveal something about the mentality of the time. Similarly, the greatest common divisor of several numbers is the product of the largest powers of the primes that divide all the given numbers. The credibility of such folklore can be questioned though. Cyclic convolution and Fourier transform are an important part of digital signal processing, as well as computer science and mathematics. Self learning Mathematics more than 10 years, and also start to learn coding at the end of the 2017. In the calculator, you can remove a congruence by clicking the little red X in that row.

He promised to repay her for her kindness after he had made great achievements in life, but it was rebuffed by her. You should check these statements yourself, using the definition of what it means for a number to correspond to a point. If you are interested in supporting my YouTube Channel: here is the link to my Patreon page: You can sign up to be a Patron, and give a donation per view, up to a specified monthly maximum. To eliminate the restriction, what you can do is explode these congruence into smaller congruence. To learn more, see our. But we know that the proliferation of Chinese generals and soldiers in connection with it comes from late fables.

So, it seems that the name Chinese Remainder Theorem is not completely unreasonable, since according to Wylie, it's not clear when the general form was discovered, or at least might not have been at the time the theorem got its name. After all of these preparations, we are now ready to step in the last step. Like most sources, Dickson is giving the history of the spread of the idea and not the origin of the name. If we count them by threes, we have two left over; by fives, we have three left over; and by sevens, two are left over. But the phrasing does suggest that the name came into use before 1929.

Use MathJax to format equations. You can subscribe to my newsletter by submit your email at below, you will be notified when I post new article in Algebrot! Has any of these things actually happened? Of course, there are lots of numbers that all correspond to the same point. The fact is, number theory want to become friendly to you, so it use symbol like that to draw you mind into learning number theory. Extended version of the theorem Suppose one tried to divide a group of fish into , and parts instead and found , and fish left over, respectively. Now if the numbers satisfy: for every , then a solution for is: Proof If , then and differ by a multiple of , so and. Wolfram Web Resources The 1 tool for creating Demonstrations and anything technical.

Splitting one congruence to their child congruence which are modulo by its coprime factors is easy. Once, when he was suffering from hunger, he met a woman who provided him with food. Another Chinese general associated with the theorem is , who lived c. Provide details and share your research! Instead of recording the number of soldiers in an army, the Chinese would record remainders modulo various numbers presumably in hope that the intended recipient would be able to apply the theorem to compute the original number, but the spy would not. Problems of this kind are all examples of what universally became known as the Chinese Remainder Theorem.

I would not become famous even if I killed him then. This motivated work in trigonometry, particularly spherical trigonometry, of both Indian and Arab mathematicians. Let's pause for a moment. Also, for some reason, the Google books link for Wylie doesn't give me any text, maybe because I'm in Australia. Wylie introduced the solution of Sun Zi's remainder problem i. However, grouping multiple congruence into a line of bigger congruence will cost more effort, and it is the main purpose of Chinese Remainder Theorem. If the congruence does obey the restriction, then it must have a solution.

Thanks for contributing an answer to History of Science and Mathematics Stack Exchange! In tracing the course of this process we find it gradually becoming clearer till towards the end of the Sung dynasty, when the writings of Tsin Keu-chaou put us in full possession of the principle, and enable us to unravel the meaning of the above mysterious assemblage of numerals. Let's now solve the two problems we started the page with. What is the smallest number of eggs she could have had? What is the smallest number of eggs she could have had? Mike Bertrand January 7, 2017. Use MathJax to format equations. This lecture discusses some aspects of Chinese, Indian and Arab mathematics, in particular the interest in number theory: Pell's equation, the Chinese remainder theorem, and algebra.

Any number with remainder mod must be and any number with remainder mod must be. I think it's possible that the Chinese Remainder Theorem became well-known early on among mathematicians elsewhere in Asia after Sun Zi published his book. The Chinese Remainder Theorem states that when the moduli of a system of linear congruences are pairwise relatively prime, there is a unique solution of the system modulo the product of the moduli. Of course, the person who first found the theorem is important, perhaps even more important. An equivalent statement is that if , then every pair of modulo and corresponds to a simple modulo. Hints help you try the next step on your own.