affine perspectivity
1Desargues' theorem — Perspective triangles. Corresponding sides of the triangles, when extended, meet at points on a line called the axis of perspectivity. The lines which run through corresponding vertices on the triangles meet at a point called the center of… …
2Homologie (transformation géométrique) — Pour les articles homonymes, voir Homologie.  Ne pas confondre avec la notion d homologie en topologie algébrique …
