Block subspace expansions for eigenvalues and eigenvectors approximation

Francisco Arrieta Zuccalli, Pedro Massey, Demetrio Stojanoff

Let $A\in {\mathbb{C}}^{n\times n}$ and let $\mathcal{X}\subset {\mathbb{C}}^n$ be an $A$-invariant subspace with $\dim \mathcal{X}=d\ge 1$, corresponding to exterior eigenvalues of $A$. G…