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 show that there is a countable universal abelian p-group for purity, i.e.,a countable abelian p-group $U$ such that every countable abelian p-grouppurely embeds in $U$. This is the last result needed to provide a completesolution to Problem 5.1 of [Fuc15] below $\aleph_\omega$. We introduce$\aleph_0$-strongly homogeneous p-groups, show that there is a universalabelian p-group for purity which is $\aleph_0$-strongly homogeneous, andcompletely characterize the countable $\aleph_0$-strongly homogeneous p-groups.

A countable universal torsion abelian group for purity