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

Two metrics $g $ and $\bar g$ are geodesically equivalent, if they share thesame (unparameterized) geodesics. We introduce two constructions that allow oneto reduce many natural problems related to geodesically equivalent metrics,such as the classification of local normal forms and the Lie problem (thedescription of projective vector fields), to the case when the (1,1)-tensor$G^i_j:= g^{ik} \bar g_{kj}$ has one real eigenvalue, or two complex conjugateeigenvalues, and give first applications. As a part of the proof of the mainresult, we generalize Topalov-Sinjukov (hierarchy) Theorem forpseudo-Riemannian metrics

Splitting and gluing constructions for geodesically equivalent pseudo-Riemannian metrics