I know that P = A(A(adsbygoogle = window.adsbygoogle || []).push({}); ^{T}A)^{-1}A^{T}for a projection matrix.

I was just wanting to know how to describe the matrix A as general as possible. For example do the columns and rows of A have to be linearly independant?

Also I know that P = BB^{T}is the projection matrix but how could I describe B as well.

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# Projection matrix

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