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

An area metric is a (0,4)-tensor with certain symmetries on a 4-manifold thatrepresent a non-dissipative linear electromagnetic medium. A recent result bySchuller, Witte and Wohlfarth provides a pointwise normal form theorem for sucharea metrics. This result is similar to the Jordan normal form theorem for(1,1)-tensors, and the result shows that any area metric belongs to one of 23metaclasses with explicit coordinate expressions for each metaclass. In thispaper we restate and prove this result for skewon-free (2,2)-tensors and showthat in general, each metaclasses has three different coordinaterepresentations, and each of metaclasses I, II, ..., VI, VII need only onecoordinate representation.

A restatement of the normal form theorem for area metrics