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  • Geer, N.; Kashaev, R.; Turaev, V. (De Gruyter, 2012)
    We introduce systems of objects and operators in linear monoidal categories called $\hat{\Psi}$-systems. A $\hat{\Psi}$-system satisfying several additional assumptions gives rise to a topological invariant of triples (a ...
  • Ghadyali, Hamza; Dowlin, Nathan (Indiana University Department of Mathematics, 2010)
    Given a CAT(0) group G acting geometrically on a proper CAT(0) space, we attempt to demonstrate that any torsion subgroup of G has nite cardinality.

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