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

Let T denote Thompson's group of piecewise 2-adic linear homeomorphisms ofthe circle. Ghys and Sergiescu showed that the rotation number of every elementof T is rational, but their proof is very indirect. We give here a short,direct proof using train tracks, which generalizes to PL homeomorphism of thecircle with rational break points and derivatives which are powers of somefixed integer, and also to certain flows on surfaces which we call"Thompson-like". We also obtain an explicit upper bound on the smallest periodof a fixed point in terms of data which can be read off from the combinatoricsof the homeomorphism

Denominator bounds in Thompson-like groups and flows