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

We develop an abstract theory to obtain Harnack inequality for nonhomogeneous PDEs in the setting of quasi metric spaces. The main idea is toadapt the notion of double ball and critical density property given by DiFazio, Guti\'errez, Lanconelli, taking into account the right hand side of theequation. Then we apply the abstract procedure to the case of subellipticequations in non divergence form involving Grushin vector fields and to thecase of X-elliptic operators in divergence form.

Abstract approach to non homogeneous Harnack inequality in doubling quasi metric spaces