In this page: http://en.wikipedia.org/wiki/Projection_(linear_algebra)#cite_note-0
(and in my book)
In linear algebra and functional analysis, a projection is a linear transformation P from a vector space to itself such that P^2 = P
What is the meaning of P^2 here?

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Here http://en.wikipedia.org/wiki/Projection_(linear_algebra)#Simple_example

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