2 problems

Let $A\in\mathbb{R}^{n\times n}$ be a symmetric matrix and let $v\in\mathbb{R}^{n\times p}$ be a block vector. Let $s$ be the largest index such that the block Krylov subspace…

Let the Krylov matrix be formed from a random matrix with $\frac{}{}$ non-zeros per column as in the preceding minimum singular value bound, and consider both the sparse Krylov con…