# Perspective

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with centre A mapping of a plane into a plane under which each point in is put into correspondence with the point of intersection of the straight line with (if is not parallel to , see Fig.). Figure: p072410a

More generally, let and be proper subspaces of identical dimension in a projective space and let be a subspace of maximal dimension not having points in common with or . Let be a subspace contained in , let be the subspace of minimal dimension containing and and let be the intersection of and .

The correspondence by which each subspace contained in is put into correspondence with the subspace contained in is called a perspective mapping from into with perspective centre .

A perspective is a collineation. If the subspaces and intersect, then each point in the subspace corresponds to itself.

If projective coordinates are introduced into the spaces and , then a perspective correspondence can be specified by a linear mapping.

How to Cite This Entry:
Perspective. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Perspective&oldid=18072
This article was adapted from an original article by P.S. Modenov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article