Title: The derived modular group
Speaker: Loic Merel（Universite Pierre and Maire Curie, Paris）
Time: 10:00-11:30, June12
Location: Room 201，Ming De Building
Abstract: The modular group (SL_2(Z)) is among the most famous groups in mathematics, and the basis for the theory of modular forms etc. Its derived subgroup is cocyclic of index 12, and the subject of a thin and not very well known literature. However, it is the source of delightful mathematics, that we will review before considering the use of this group for Manin's theory of modular symbols (Manin's theory will be recalled from scratch).
