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/

Zendy Plus

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

Zendy Tools

Zendy Open

We consider a class of Jacobi matrices with unbounded entries in the socalled critical (double root, Jordan box) case. We prove a formula for thespectral density of the matrix which relates its spectral density to theasymptotics of orthogonal polynomials associated with the matrix.

Titchmarsh-Weyl formula for the spectral density of a class of Jacobi matrices in the critical case