But in "Hatsubi sanpo" Seki only describes single-variable algebraic equations which can be worked out by erasing a variable (even giving some answers whose formulas were not given in detail), and the details of Tensan jutsu (Bosho-ho)'s role in the background were not given.
ただし、『発微算法』は変数を消去して得られる一変数代数方程式が書かれているだけで（それすらも詳細を端折った回答もあった）、その背景にある点竄術（傍書法）は一切表に現れない。