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-- Mathematics - Section B2
Algebra
Let $A=[a_{ij}]$ be $2 × 2 $ matrix, where $aij=\left\{\begin{matrix}1 & i≠j\\0 & i=j \end{matrix}\right.$, then
$A^{22}-A^7+A=I$
$A^{23}-A^7+A=I$
$A^{22}-A^8+A=I$
$A^{23}-A^8-A=I$