3 problems

Let $A$ be the matrix, let $B$ be the output of incomplete selected inversion, and let $F$ denote the error matrix in the notation of the paper's selected-inversion setup. Write…

Consider the recursive error estimates for the dropped entries in an incomplete $LDL^T$ factorization, where the error terms may recur on the right-hand side of the selected-invers…

Let $H$ be the matrix and let $E$ denote the error matrix in the notation of the paper's selected-inversion setup. Write $\mathrm{level}(i,j)$ for the level of fill between indices…