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 Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

During his last year of life Feynman became interested in integrable models.In the course of his study of one dimensional particles with inversesquare-type potentials (the Calogero class of models) he came up with a fieldtheory-inspired proof of the commutativity of the integrals of motion of thesystem, which remained unpublished. I present an exact transcript of the prooftogether with a scan of the first page of Feynman's original manuscript andsome historical background.

Feynman's proof of the commutativity of the Calogero integrals of motion