Can anyone explain this property to me please? If P is an orthogonal projection matrix, then I - 2P is unitary. Thanks.
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Originally Posted by Bucephalus Can anyone explain this property to me please? If P is an orthogonal projection matrix, then I - 2P is unitary. Thanks. Let's see: , since a projection is orthogonal iff it is self-adjoint, and then: (why?) is unitary. Tonio
that's awesome. Thanks Tonio
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