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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The classical Mackey–Arens theorem states that every locally convex space has a Mackey space topology. However, in the wider class of locally quasi-convex (lqc) groups an analogous result does not hold. Indeed, Außenhofer and the author showed independently that the free abelian topological group \(A(\mathbf {s})\) over a convergent sequence \(\mathbf {s}\) does not admit a Mackey group topology. We essentially extend this example by showing that the free abelian topological group A(X) over a non-discrete zero-dimensional (for example, countable) metrizable space X does not have a Mackey group topology.

The Mackey problem for free abelian topological groups