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

The paper considers the Novikov problem of describing the geometry of levellines of quasi-periodic functions on the plane. We consider here the mostgeneral case, when the number of quasi-periods of a function is not limited.The main subject of investigation is the arising of open level lines or closedlevel lines of arbitrarily large sizes, which play an important role in manydynamical systems related to the general Novikov problem. As can be shown also,the results obtained for quasiperiodic functions on the plane can begeneralized to the multidimensional case. In this case, we are dealing with ageneralized Novikov problem, namely, the problem of describing level surfacesof quasiperiodic functions in a space of arbitrary dimension. Like the Novikovproblem on the plane, the generalized Novikov problem plays an important rolein many systems containing quasiperiodic modulations.

On the Novikov problem with a large number of quasiperiods and its generalizations