The Mathematical Institute (Institut de Mathématiques de Bordeaux - IMB) is located on the campus of the Bordeaux 1 university, in the suburban town of Talence. From the main entrance of the university, you see it towards your right. Here is a picture of the main entrance to the institute. On the map of the campus, look for building A33 on the right-hand side, the institute is there.

From the train station (Bordeaux Saint-Jean), take the Tramway Line C, get off at Quinconces and change to tram B towards Pessac centre and get off at Forum. Then keep walking for about 300 meters along the line towards the next station; roughly 100 meters after passing a roundabout, you will find the main entrance to the university on your right. Go in, the institute will shine brightly in the distance (150 meters or so) towards your right.

From the Bordeaux Mérignac airport. A shuttle operates every 45 minutes during daytime (timetable); take the shuttle and get off at Office de Tourisme /12 cours du XXX juillet, then take Tram B on the place des Quinconces towards Pessac centre and get off at Forum. It is also possible to take a taxi for about 40 euros for a one way trip.

Here is a map of the tram network. For more information on local transports, check the following website (in french).