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Statement 1: if D=diag[d1, d2, ,dn],the...

Statement 1: if `D=`diag`[d_1, d_2, ,d_n]`,then `D^(-1)=`diag`[d_1^(-1),d_2^(-1),...,d_n^(-1)]` Statement 2: if `D=`diag`[d_1, d_2, ,d_n]`,then `D^n=`diag`[d_1^n,d_2^n,...,d_n^n]`

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