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 $k$ be a field and $X \subset P^3_{k}$ a smooth cubic surface. Let$\Delta \subset Pic(X)$ be the finite index subgroup spanned by norms of lineson $X_{K}$ for $K$ running through the finite separable extensions of $k$. Thequotient $Pic(X)/\Delta$ is 3-primary. If $X$ contains a line defined over $k$,then $\Delta=Pic(X)$.

Normes de droites sur les surfaces cubiques