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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The Killing operator on a Riemannian manifold is a linear differentialoperator on vector fields whose kernel provides the infinitesimal Riemanniansymmetries. The Killing operator is best understood in terms of itsprolongation, which entails some simple tensor identities. These simpleidentities can be viewed as arising from the identification of certain Liealgebra cohomologies. The point is that this case provides a model for morecomplicated operators similarly concerned with symmetry.

Symmetry via Lie algebra cohomology