I don't know how to read $|F|_{pq}$ in this paper (Eisenfeld 1976 - Block diagonalization and eigenvalues). Is it a determinant of rectangular matrix? Or is it some other metrics? Note that $F$ is a matrix with p rows and q columns.
2026-04-03 09:23:30.1775208210
Determinant of a rectangular matrix?
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By $|F|_{pq}$ Eisenfeld denotes a norm ! For details see page $210$.