Source: http://perso.eleves.ens-rennes.fr/people/marie.derrien/154%20Sous-espaces%20stables%20par%20un%20endomorphisme%20ou%20une%20famille%20d%E2%80%99endomorphismes%20d%E2%80%99un%20espace%20vectoriel%20de%20dimension%20finie.%20Applications.pdf