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Multiple period integrals and cohomology

This work gives a version of the Eichler-Shimura isomorphism with a non-abelian $H^1$ in group cohomology. Manin has given a map from vectors of cusp forms to a noncommutative cohomology set by means of iterated integrals. We show Manin's map is injective but far from surjective. By extending Manin's map we are able to construct a bijective map and remarkably this establishes the existence of a non-abelian version of the Eichler-Shimura map.

preprint2015arXivOpen access
Roelof BruggemanYoungju Choie
math.NT
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Open access2 authors1 topic
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Roelof BruggemanYoungju Choie

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