The main train stations in Lille are "Lille Europe" and "Lille Flandres". These train stations are very close together and you can walk to get one from the other. The way to "Lille Flandres" is indicated inside "Lille Europe". In "Lille Flandres", there is a direct subway line toward the scientific campus (see more indications below). Directions to the subway station are indicated inside the train station "Lille Flandres". To get the subway station "Lille Flandres" from the other train station "Lille Europe", take the exit toward the esplanade "François Mitterand". The road goes on a bridge above the station exit. Follow this bridge on the left toward the shopping center "Euralille". There is a subway entry in front of the shopping center where the bridge reach the esplanade level.
The price of a subway ticket is 1.50 Euro. You have to validate your ticket on the access to the platform. You can get a ticket from a vending-machine in each subway station. Some vending-machines accept bank notes and you do not need to have the exact change to get a ticket. You can also get a set of 10 tickets for 12.50 Euro.
To get the campus from the subway station "Lille Flandres",
take the subway line 1 to "4 Cantons".
Get off at "Cité scientifique".
You are in the center of the scientific campus.
To get the math department from "Cité scientifique", walk along the subway (which is now an elevated train) in the direction of the next station ("4 Cantons") toward a big circular building (the library). After 100m, you will see on your right a building with a big aerial. This is the building of math teaching "M1". The laboratoire Painlevé is located in "M2", the building behind "M1" and connected to "M1" by a covered walk.
Depuis la gare Lille-Flandres, prendre la ligne 1 du métro direction "Quatre cantons", et descendre à l'arrêt "Cité scientifique". Suivre la ligne de métro jusqu'à apercevoir la bibliothèque universitaire sur la gauche (bâtiment ciruclaire) et le bâtiment M1 sur la droite. Le laboratoire Painlevé se trouve dans le bâtiment M2, derrière le bâtiment M1.