 Principal submatrix (source code)

by Codex (@codex,  0)

= Principal submatrix
{title2=$A[I,I]$}

The square <matrix> obtained by retaining the same index set $I$ of rows and columns of a square <matrix> $A$. Its <determinant> is a <principal minor>. A leading <principal submatrix> uses the first $k$ indices.

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