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

For the Heyting Arithmetic HA, HA* is defined as the theory $\{A\mid {\sfHA}\vdash A^{\Box}\}$, where $A^{\Box}$ is called the box translation of $A$.We characterize the $\Sigma_1$-provability logic of HA* as a modal theory ${\sfiH}_\sigma^*$.

The $\Sigma_1$-Provability Logic of HA*