Question: 74. Let A be a *k* ** *n* matrix. Show that I - 2AA - is an orthogonal matrix. Show 1 I - 2AA -

74. Let A be a *k* *×* *n* matrix. Show that I - 2AA- is an orthogonal matrix. Show 1 I - 2AA- is orthogonal for any L-inverse of A.

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