 The Mathematics Department is located in the Saint-Martin buildings of the University of Cergy-Pontoise (be careful, it is not in the main buildings of the University!).
The building is at equal distance from the trainsstation of Pontoise and the one of Cergy-Prefecture.
The easiest way to get here is probably to come by the RER A (see
below). This will take you about 45 min from the center of Paris.
 How to come by train
There are FIVE possibilities to come from Paris. Two bring to Cergy-Prefecture, three bring to Pontoise.
Timeschedule on the website of the "Transilien"
Arrival at Cergy-prefecture: take the RER A or the train at the railstation Paris Saint-Lazare :
1) In both caes, go direction Cergy
and get off at the station Cergy-Préfecture.
2) In the station, take the exit on the left, called "Bd de l'Oise" and
go left. Do not take the stairs at the very left (direction "Centre
Ville") but just turn left on the Boulevard de l'Oise and walk through
the bus station, along the Boulevard.
3) Walk for about 200m. At the next cross (there is a little roundabout in the middle), you can see buildings of
the university in front of you: they are not the right ones ! Take the
road on the right (Boulevard du Port) and continue straight for about
300m, in the direction of the big building of the "Caisse d'Epargne".
4) The
road passes under three bridges, the last being the highway A15/N14. You
will have to cross the exit of the highway (there is a car seller at
the other side of the street). A little bit further, you can see the
Saint-Martin buildings on the right (a modern building).
5)
If you participate to a special event taking place in the "Amphi
Colloque" or "Amphi A1", you will have to take the outdoor stairs which are just
when you arrive at the beginning of the building. But if you need to go
to the mathematics department, you have to continue straight and
take the main entrance which is located at the very end of
the building, on the ground floor.
It will take you about 10 min to arrive here from the Cergy-Préfecture train station.
Arrival at Pontoise: Suburban Train from Paris Nord, Paris Saint-Lazare or RER C:
1) At the Gare du Nord or the Gare Saint-Lazare, take a train in the direction
of Pontoise. You can also take the RER C in the center of Paris in the direction
of Pontoise (but this might be quite long). Get off at Pontoise.
2)
Arrived at the station of Pontoise, take the exit "Gare Routière
Canrobert" (bus station located at the opposite of the main exit). You
have to take the bridge above the tracks and take a left ;
3) in the bus station, take the only road which goes out (it goes up on a little hill) ;
4) at the main crossing at the top of the hill, take the
"Chaussée Jules César to the right (walk on the left side
of the road) ;
5) then take the second road on the left, called "Avenue
François MItterrand". There is a big sign for cars indicating
"Université de Saint-Martin" and the highway "A15" ;
6)
the main entrance of the university is located on the left side of this avenue, see the map above.
How to come by car
1) From Porte Maillot: follow La Défense and continue straight in the direction of Cergy-Pontoise (A86).
2) After about 7 km on the highway A86,
take the highway A15, direction Cergy-Pontoise.
3) Take the exit number 9 (Pontoise Centre), and then the first
street on the right (avenue François Mitterrand).
The Saint-Martin buildings are located at about 200 m on the
right.
How to come by plane
If you arrive directly by plane, take first a train to the center
of Paris and then take the RER A at Châtelet-Les-Halles.
Remark: if you arrive at Roissy-Charles-De-Gaulle Airport, there is also a bus going directly to the Cergy-Prefecture station (line no 95-18, timetable - updated 10/2009), in approximately one hour.
How to find the department in the Saint-Martin buildings
Once
you are in the University (level 0), take the lift which is on the left
of the "Amphithéâtre LWOFF" when you enter by the main entrance, and go to the 5th floor. When you exit the lift, simply go straight, you will access to the new building of the Mathematics Department.
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