Most of the time the two mathematicians worked independently, but for this paper they were able to use Elie Cartan 's expertise on Lie groups to tackle questions that Henri had been interested in. The year in which this joint paper appeared was the one when Cartan left his position in Lille and, starting in November 1931, he took up a post at the University of Strasbourg.
Karamihan ng panahon ang dalawang mathematicians nagtrabaho nang malaya, ngunit para sa papel na ito sila ay able sa gumamit Elie Cartan 's kadalubhasaan sa humiga / magsinungaling sa mga grupo ng mga katanungan kagamitan na Henri had been in Ang mga taong interesado sa pinagsamang papel na ito ay lumitaw ang isa kapag Cartan kaliwa ng kanyang posisyon sa Lille at, simula noong Nobyembre 1931, siya took up ng isang post sa University of Strasbourg.