Desargues' Theorem
The theorem states that if the lines AA′, BB′, and CC′ are concurrent at O, then BC and B′C′ intersect at a point L, CA and C′A′ intersect at M, and AB and A′B′ intersect at N, where L, M, and N are collinear.
The centre and axis of a perspectivity
O is called the centre of perspectivity of the triangles ABC and A′B′C′ and the line LMN is called the axis of perspectivity. The dual of Desargues's Theorem is then its converse.
- torus
- torus
- total differential
- total expectation law
- total force
- totally bounded
- totally disconnected
- total order
- total probability law
- total relation
- totient function
- touch
- tower law
- Tower of Brahma
- Tower of Hanoi
- trace
- tractrix
- trail
- trajectory
- transcendental number
- transfinite number
- transformation
- transformation group
- transformation matrix
- transition map