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

We study surfaces of bidegree (1,d) contained in the flag threefold inrelation to the twistor projection. In particular, we focus on the number andthe arrangement of twistor fibers contained in such surfaces. First, we provethat there is no irreducible surface of bidegree (1,d) containing d+2 twistorfibers in general position. On the other hand, given any collection of (d+1)twistor fibers satisfying a mild natural constraint, we prove the existence ofa surface of bidegree (1,d) that contains them. We improve our results for d=2or d=3, by removing all the generality hypotheses.

Twistor fibers in hypersurfaces of the flag threefold