Even today, mathematics in Japan is top class and has many mathematicians.
The mathematics we have learned today came from Europe during the Meiji era.
So wasn't there much mathematical knowledge before that? I think it's different.
In fact, Japan has had world-class mathematics skills since the Edo period.
Until the Edo period, mathematics was Wasan! !!
The basis of mathematics came to Japan after the 7th century by the envoys to Tang and Sui arithmetic . It is said that he brought back the academic discipline and spread it throughout the country.
By this time, [ multiplication table ] Was also known, and the three-square theorem was also transmitted.
This brought-in mathematics will develop uniquely in Japan and progress as [Wasan]. It was during the Edo period that this Wasan developed rapidly.
It was Seki Takakazu, a scholar from the Edo period, who greatly contributed to the progress of Wasan.
Since the appearance of Seki Takakazu, Wasan will develop significantly.
In the early Edo period, before the appearance of Seki, Mitsuyoshi Yoshida's [ Jinkoki ], How to use the abacus and [rat calculation], etc., which are written in the book, were known.
In the primary education of Terakoya, this book was also used to help spread basic mathematics. Since then, some Wasan scholars have published various mathematical books with reference to Jinkoki, but it seems that many of them were written as [~ Jinkoki] following Jinkoki.
The "Tsurukame calculation" that everyone knows was Wasan! ??
" Tsurukame " for mathematics learned in cram schools by elementary school students taking junior high school exams There is something called.
There were 35 cranes and turtles in total. If you have a total of 94 legs, how many are each? ]
Have you ever heard of such a problem?
If you are a junior high school student who has learned simultaneous equations, you can solve it. There are several such mathematical solutions in Wasan.
[How many kilometers will the two meet when people with different speeds start at the same time from two remote locations, A and B? ]
"Traveler calculation" (Tabibitozan) Ya,
[Two mouse couples give birth to 10 children, and a total of 6 couples with parents and children give birth to 10 children each next month. How many mice will be in a year's time when they also couple and give birth to 10 pups each? ]
"mouse calculation" And so on.
The circumference ratio was also calculated by Wasan! ??
The famous pi of 3.14 [π] was calculated by the Dutch in the 17th century up to 35 digits. Currently, it was written that a scholar who is a pi enthusiast calculated up to 10 trillion digits on a supercomputer etc., but since it was in 2011, I may say more now.
In Japan, in the Edo period of 1663, a person named Shigekiyo Muramatsu said [ Sanso . ], Explaining how to find the pi, and writing the calculation results up to 21 digits. It is said that Newton could only calculate up to 14 digits, so you can see that he had the world's top level mathematical ability.
Algebra is also Wasan! ??
Seki Takakazu finally appears here.
Takakazu is [ side writing method ] I came up with the algebra called. In short, it's a formula that uses X and Y. Of course, since it was in the Edo period, it seems that the equivalent Chinese characters were applied instead of X and Y.
Wasan is an academic discipline that was originally developed in Japan, which was a policy of seclusion.
I was surprised that I had reached the top level in the world, even though I developed by trial and error completely by myself.