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

The envelope theory is a method to easily obtain approximate, but reliable,solutions for some quantum many-body problems. Quite general Hamiltonians canbe considered for systems composed of an arbitrary number of differentparticles in $D$ dimensions. In the case of identical particles, a compact setof 3 equations can be written to find the eigensolutions. This set providesalso a nice interpretation and a starting point to improve the method. It isshown here that a similar set of 7 equations can be determined for a systemcontaining an arbitrary number of two different particles.

Compact equations for the envelope theory