I'm wondering if there's a canonical notation for the reverse identity matrix, i.e. $$ ?=\left(\begin{array}{ccccc} 0 & 0 & 0 & 0 & 1\\ 0& 0 & 0 & 1 & 0\\ 0 & 0 & 1 & 0 & 0\\ 0 & 1 & 0& 0 & 0\\ 1&0 & 0 & 0 & 0 \end{array}\right) $$ Sometimes I've seen $J_n$ but I'm not quite satysfied since I usually use this notation for the antisymmetric version of this matrix. Is it a standard notation?
2026-02-23 23:28:20.1771889300
Notation for the reverse identity matrix
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