非ひ調ちょう和わ比ひ

noun

anharmonic ratio; cross ratio

Technical term in projective geometry; refers to the ratio of ratios of distances among four collinear points.

• 射しゃ影えい幾き何か学がくでは、非ひ調ちょう和わ比ひは基き本ほん的てきな不ふ変へん量りょうである。

  In projective geometry, the cross ratio is a fundamental invariant.