Question #215508

If T and S are similar then prove that T^(2) and S^(2) are also similar .Further if T and S are invertible then prove that T^(-1) and S^(-1) are also similar.


1
Expert's answer
2021-07-12T05:36:28-0400

Let TT and SS be similar. Then T=A1SAT=A^{-1}SA for some invertible A.A. It follows that T2=TT=(A1SA)(A1SA)=A1S(AA1)SA=A1SSA=A1S2A,T^2=TT=(A^{-1}SA)(A^{-1}SA)=A^{-1}S(AA^{-1})SA=A^{-1}SSA=A^{-1}S^2A, and hence T2T^2 and S2S^2 are also similar. If TT and SS are invertible, then T1=(A1SA)1=A1S1(A1)1=A1S1A,T^{-1}=(A^{-1}SA)^{-1}=A^{-1}S^{-1}(A^{-1})^{-1}=A^{-1}S^{-1}A, and we conclude that T1T^{-1} and S1S^{-1} are also similar.


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