tha: ทวิภาวะ

Information
has URI	http://lexvo.org/id/term/tha/%E0%B8%97%E0%B8%A7%E0%B8%B4%E0%B8%A0%E0%B8%B2%E0%B8%A7%E0%B8%B0

Meaning
means	(noun) (geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry duality