.. _theory:

Theory
======

The theory underlying this software is derived in the corresponding
`publication <https://pubs.aip.org/aip/jcp/article/158/12/124128/2881714/Perturbation-theoretical-approaches-to-strong>`_ .

A very brief open-source introduction into a related polaritonic method
can be found at `psi4numpy <https://github.com/psi4/psi4numpy/tree/master/Polaritonic-Quantum-Chemistry>`_ 
and a quick introduction into the ADC family of methods can be found on
the `adcc homepage <https://adc-connect.org/v0.15.13/theory.html>`_ .