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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Consider a rigid body having a fixed point in a superposition of two constantforce fields (for example, gravitational and magnetic). Introducing thecondition of Kowalevski type, O.I.Bogoyavlensky (1984) has found the firstintegral generalizing that of Kowalevski and pointed out the integrable casewith two invariant relations, which reduces to the 1st Appelrot class when oneof the fields vanishes. The article presents a new case with two invariantrelations integrable in Jacobi sense and generalizing the 2nd and 3rd classesof Appelrot.

One class of solutions with two invariant relations for the problem of motion of the Kowalevski top in double constant field