複ふく比ひ

noun

compound ratio; cross ratio; compound proportion

Mathematical term used in geometry and proportion theory. In projective geometry, 'cross ratio' is the most common English equivalent.

• 射しゃ影えい幾き何か学がくでは、複ふく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.