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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

New sum and product uncertainty relations, containing variances of three orfour observables, but not containing explicitly their covariances, are derived.One of consequences is the new inequality, giving a nonzero lower bound for theproduct of two variances in the case of zero mean value of the commutatorbetween the related operators. Moreover, explicit examples show that in somecases this new bound can be better than the known Robertson--Schr\"odinger one.

Variance uncertainty relations without covariances for three and four observables