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 present a method to compute finite index subgroups of $PSL_2(\mathbb{Z})$.Our strategy follows Kulkarni's ideas, the main contribution being a recursivemethod to compute bivalent trees and their automorphism group. As a concreteapplication, we compute all subgroups of index up to 20. We then use thisdatabase to produce tables with several arithmetical properties.

On computing finite index subgroups of PSL(2,Z)