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

Two extensions of the C-systems of da Costa are considered, and both are shown to collapse all but the base system C ω into classical logic. The general result is established that there is no extension of the stronger C-systems which both enjoys the intersubstitutivity property and is weaker than classical logic. Methods of constructing alternative but related hierarchies for which this property might more successfully be secured are suggested

Paraconsistency and the $\rm C$-systems of da Costa.