2 problems

Let $F$ be a simple $k\times \ell$ $(0,1)$-matrix. A product of matrices is obtained by stacking, in order, one column from each factor; the factors here are identity matrices $I$,…

Let $n\geq 3$ and let $A\in\{0,1\}^{n\times n}$ be a nonsingular symmetric 0–1 matrix. The enhanced principal rank characteristic sequence of a symmetric matrix records, for each o…