Especially during the period when Takakazu SEKI and Katahiro TAKEBE were active, problems concerning diagrams were represented and solved as algebra problems by applying simple relations such as Pythagorean theorem.
特に関孝和や建部のころは、図形の問題はピタゴラスの定理など、簡単な関係を用いて代数の問題に直して処理していた。