抄録
There are two parts in this article. In the first part (from section 2 to section 5), I describe the whole structure of the chapter II "Ritsugen" of Takebe Katahiro's treatise Tetsujutsu Sankei and consider the process of an establishment of unknowns and equations in pre-modern Japanese mathematics through an analysis of the chapter. The second part (section 6) consists of the chapter's reprinting with translation and full annotation.
