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/

Zendy Plus

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

Zendy Tools

Zendy Open

For a given set of queries (which are expressions in some query language)$\mathcal{Q}=\{Q_1$, $Q_2, \ldots Q_k\}$ and for another query $Q_0$ we saythat $\mathcal{Q}$ determines $Q_0$ if -- informally speaking -- for everydatabase $\mathbb D$, the information contained in the views$\mathcal{Q}({\mathbb D})$ is sufficient to compute $Q_0({\mathbb D})$. QueryDeterminacy Problem is the problem of deciding, for given $\mathcal{Q}$ and$Q_0$, whether $\mathcal{Q}$ determines $Q_0$. Many versions of this problem,for different query languages, were studied in database theory. In this paperwe solve a problem stated in [CGLV02] and show that Query Determinacy Problemis undecidable for the Regular Path Queries -- the paradigmatic query languageof graph databases.

Can One Escape Red Chains? Regular Path Queries Determinacy is Undecidable