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 prove a constant rank theorem for the second fundamental form of thespatial convex level surfaces of solutions to equations $u_t=F(\n^2u, \n u, u,t)$ under a structural condition, and give a geometric lower bound of theprincipal curvature of the spatial level surfaces.

Curvature estimates for the level set of spatial quasiconcave solutions to a class of parabolic equations