Stefan Waldmann (Univ. Würzburg) will speak in the geometry seminar next Tuesday, 14th of June, at 2pm in the Salle des Professeurs. His title is: *An explicit construction of Drinfel’d twists*.

differential geometry at the Université libre de Bruxelles

Stefan Waldmann (Univ. Würzburg) will speak in the geometry seminar next Tuesday, 14th of June, at 2pm in the Salle des Professeurs. His title is: *An explicit construction of Drinfel’d twists*.

The department of mathematics is in building NO, on the Campus de la Plaine, of the Université libre de Bruxelles. The geometry group is on the 7th floor. This map shows NO, as well as the metro station Delta and the stop for the number 71 bus. The number 95 also stops a short walk from the department. See the STIB website for more information on public transport in Brussels.

Polished ammonite fossil, by Kara Stenberg, Creative Commons licence CC BY-NC 2.0.

Model of 3D projection of a 120-cell, by Edmund Harriss.

The root system of the exceptional Lie algebra E8. By Jared Tarbell, Creative Commons Licence CC BY 2.0.