Iterated Shimura integrals
arXiv:math/0507438
Abstract
In this paper I continue the study of iterated integrals of modular forms and noncommutative modular symbols for started in [Ma3]. Main new results involve a description of the iterated Shimura cohomology and the image of the iterated Shimura cocycle class inside it. The concluding section of the paper contains a concise review of the classical modular symbols for SL(2) and a discussion of open problems.
16 pages