Abstract Birch and Swinnerton-Dyer conjecture is one of the most famous and important problem in pure math, which predicts deep relations between several invariants of elliptic curves defined over number fields. In 1980s, Beilinson, Bloch, and Kato proposed a vast generalization of this conjecture to motives over number fields. In this talk, we will survey results in recent years concerning Bei...
AbstractLet X_n be the set of tuples of 2x2 matrices (A_1, A_2, ..., A_n) such that the product A_1...A_n is the identity matrix, and considered up to simultaneous conjugation. On each X_n, there is a very classical and explicit action of the so-called braid group B_n. This is an elementary case of the so-called mapping class group action on the character varieties of surface groups, and was st...