Parallel projection

In linear algebra and functional analysis, a projection is a linear transformation P from a vector space to itself such that P2 = P.  Projections map the whole vector space to a subspace and leave the points in that subspace unchanged.Meyer, pp 386+387

Notes

References
 N. Dunford and J.T. Schwartz, Linear Operators, Part I: General Theory, Interscience, 1958.
 Carl D. Meyer, Matrix Analysis and Applied Linear Algebra, Society for Industrial and Applied Mathematics, 2000. .

Other websites
 MIT Linear Algebra Lecture on Projection Matrices  at Google Video, from MIT OpenCourseWare

Category:Linear algebra
Category:Functions and mappings