双そう対つい性せいそうついせいMeanings1noundualitymathematicsMathematical term referring to a correspondence between two structures, such as in projective geometry or category theory.射しゃ影えい幾き何か学がくでは、点てんと直ちょく線せんの双そう対つい性せいが成なり立たつ。In projective geometry, the duality of points and lines holds.
