A=aa^T,
A^m+1=aa^T^m+1
=aa^Taa^Taa^Taa^Taa^T.
=a(a^Ta)(a^Ta)(a^Ta)(a^Ta)(a^T...
=akkkkkkkkkk..a^T
=kkkkkkkkk(aa^T)
=kkkkkkkkkkA
=k^mA
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