Show that A -1 exists if and only if the eigenvalues 1 , ,
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Show that A-1 exists if and only if the eigenvalues λ1, · · ·, λn are all nonzero, and then A-1 has the eigenvalues 1/λ1, · · ·,1/λn.
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By Theorem 1 in Sec 78 the inverse exists if and only if det A 0 On the oth...View the full answer
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