He studied infinite series , especially double series for the first time in wasan . - 無限級数、とくに和算で最初の二重級数。
He studied infinite series , especially double series for the first time in wasan . - 無限級数、とくに和算で最初の二重級数。
Alongside with that of katahiro takebe , this was the first time infinite series expansion was defined in japan . これは建部とならんで日本初の無限級数展開。
In his " takuma-ryu enri " (1722 ), he presented the infinite series expansion such as arcsin and sin . さらに、arcsin, sin などの無限級数展開を『宅間流円理』(1722)で発表。
However , as the concept of integral signs did not exist , they were rendered by what can be classified as an infinite series . ただし、積分の記号があったわけではなく、無限級数(と解釈できるもの)でこれらのものを表現した。