If $A\in M_n(\Bbb R)$, we define its signature as the triple $(s^+,s^-,s^0)$, where $s^+,s^-,s^0\in\Bbb Z_{\ge0}$ denotes respectively the number of eigenvalues $>0,<0,=0$.
How can we define the signature of a $A\in M_n(\Bbb C)$?
2026-04-30 00:08:43.1777507723
Signature of a complex matrix
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