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

We show that the In\"on\"u-Wigner contraction naturally associated to areduction chain $\frak{s}\supset \frak{s}^{\prime}$ of semisimple Lie algebrasinduces a decomposition of the Casimir operators into homogeneous polynomials,the terms of which can be used to obtain additional mutually commuting missinglabel operators for this reduction. The adjunction of these scalars that are nomore invariants of the contraction allow to solve the missing label problem forthose reductions where the contraction provides an insufficient number oflabelling operators.

journal of physics. conference series

Obtainment of internal labelling operators as broken Casimir operators  by means of contractions related to reduction chains in semisimple Lie  algebras