Abstract
In this paper, we use topological techniques to construct generalized trace and modified dimension functions on ideals in certain ribbon categories. Examples of such ribbon categories naturally arise in representation theory where the usual trace and dimension functions are zero, but these generalized trace and modified dimension functions are nonzero. Such examples include categories of finite dimensional modules of certain Lie algebras and finite groups over a field of positive characteristic and categories of finite dimensional modules of basic Lie superalgebras over the complex numbers. These modified dimensions can be interpreted categorically and are closely related to some basic notions from representation theory.
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Research of the first author was partially supported by NSF grants DMS-0706725 and DMS-0968279.
Research of the second author was partially supported by NSF grant DMS-0734226.
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Geer, N., Kujawa, J. & Patureau-Mirand, B. Generalized trace and modified dimension functions on ribbon categories. Sel. Math. New Ser. 17, 453–504 (2011). https://doi.org/10.1007/s00029-010-0046-7
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DOI: https://doi.org/10.1007/s00029-010-0046-7