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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We derive refined rigorous error estimates for approximate solutions ofSturm-Liouville and Riccati equations with real or complex potentials. Theapproximate solutions include WKB approximations, Airy and parabolic cylinderfunctions, and certain Bessel functions. Our estimates are applied to solutionsof the angular Teukolsky equation with a complex aspherical parameter in arotating black hole Kerr geometry.

Refined Error Estimates for the Riccati Equation with Applications to the Angular Teukolsky Equation