English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Let $\mathcal{M}$ be a square matrix over a commutative ring and let$\mathcal{A}$ be a principal submatrix. We give relations between thedeterminants of $\mathcal{M}$ and $\mathcal{A}$ based on an annihilatingpolynomial for one of them. The intended application is the size reduction ofcomplex latent root problems, especially the reduction of ordinary eigenvalueproblems if a matrix or its principal submatrix have a low degree minimalpolynomial. An example is the spectrum of vertex perturbed strongly regulargraphs.

Relating the spectrum of a matrix and a principal submatrix using adjugates and Schur complements