Overpartitions and class numbers of binary quadratic forms.

Proc Natl Acad Sci U S A

Mathematisches Institut, Universität Köln, Weyertal 86-90, D-50931 Cologne, Germany.

Published: April 2009

We show that the Zagier-Eisenstein series shares its nonholomorphic part with certain weak Maass forms whose holomorphic parts are generating functions for overpartition rank differences. This has a number of consequences, including exact formulas, asymptotics, and congruences for the rank differences as well as q-series identities of the mock theta type.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2666996PMC
http://dx.doi.org/10.1073/pnas.0900783106DOI Listing

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