Recent content by fredsmithsfc

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    Graduate Understanding the Limitations of the Projection onto a Subspace Equation

    That makes sense. Thanks.
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    Graduate Understanding the Limitations of the Projection onto a Subspace Equation

    Hi Fredrik, I first saw it in the Khan Academy Linear Algebra video: "Lin Alg: A Projection onto a Subspace is a Linear Transformation" which is at this link: http://www.khanacademy.org/video/lin-alg--a-projection-onto-a-subspace-is-a-linear-transforma?playlist=Linear%20Algebra But I...
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    Graduate Understanding the Limitations of the Projection onto a Subspace Equation

    The Projv(x) = A(ATA)-1ATx I'm puzzled why this equation doesn't reduce to Projv(x) = IIx since (ATA)-1 = A-1(AT)-1 so that should mean that A(ATA)-1AT = AA-1(AT)-1AT = II What is wrong with my reasoning? Thanks.