Question 2.7.14: If P has 1's on the antidiagonal from (1, n) to (n, 1), desc...

If P has 1’s on the antidiagonal from (1, n) to (n, 1), describe PAP. Note P = {P}^{T}.

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The “reverse identity” P takes (1, …, n) into (n, …, 1).

When rows and also columns are reversed, (PAP)_{ij} is (A)_{n-i+1,n-j+1}.

In particular (PAP)_{11} is {A}_{nn}.

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