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

A minimax variational principle for saddle-point solutions with prescribedenergy levels is introduced. The approach is based on the development of thelinking theorem to the energy level nonlinear generalized Rayleigh quotients.An application to indefinite elliptic Dirichlet problems is presented. Amongthe consequences, the existence of solutions with zero-energy levels isobtained.

On prescribed energy saddle-point solutions to indefinite problems