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Math Help - PROOF: Pwu = u iff u is in W

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    PROOF: Pwu = u iff u is in W

    Let W be a subspace of R^n. prove that, for any u in R^n,

    Pwu = u iff u is in W
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by jjs2168 View Post
    Let W be a subspace of R^n. prove that, for any u in R^n,

    Pwu = u iff u is in W
    and P_wu is?
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