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 the relation between the structure of algebraic and context-freesubsets of a group G and that of a finite index subgroup H. Using theseresults, we prove that a kind of Fatou property, previously studied by Bersteland Sakarovitch in the context of rational subsets and by Herbst in the contextof algebraic subsets, holds for context-free subsets if and only if the groupis virtually free. We also exhibit a counterexample to a question of Herbstconcerning this property for algebraic subsets.

Algebraic and context-free subsets of subgroups