From "Ecole Normale supérieur" (ENS) to "Université Pierre et Marie Curie (Jussieu)"
From Aeroport Charles de Gaulle: go to the exit direction "TGV - RER" or "Train". At the railway station, after buying at ticket, take the train "RER B, direction Paris". Train every 15'. Than it will take approximatively 45' to reach the station "Luxembourg".
Helpfull Transportation informations in french or in some other langages