§106.
命令法における現在完了
英語原文
On this principle the perfect imperative is used in mathematical language, to imply that something is to be considered as proved or assumed once for all, or that lines drawn or points fixed are to remain as data for a following demonstration. E.g.
Εἰλήφθω ἐπὶ τῆς ΑΒ τυχὸν σημεῖον τὸ Δ, καὶ ἀφῃρήσθω ἀπὸ τῆς ΑΓ τῇ ΑΔ ἴση ἡ ΑΕ, let any point Δ be assumed as taken in the line ΑΒ, and ΑΕ equal to ΑΔ as cut off from ΑΓ. Eucl. i. Pr. 9.
日本語解釈