**T**his is a book I carried away from JSM in Boston as the Oxford University Press representative kindly provided my with a copy at the end of the meeting. 435 more words

## Tags » Cohomology

#### The Unimaginable Mathematics of Borges' Library of Babel [book review]

#### Explicit Eichler-Shimura for GL2 over imaginary quadratic fields

Let denote the Hamilton quaternions. Set

Let be the point with , . There is a transitive action of given by with multiplication taking place in . 529 more words