Abstract
In this paper we introduce and study strongly singular maximal abelian self-adjoint subalgebras of type II1 factors. We show that certain elements of free groups and of non-elementary hyperbolic groups generate such masas, and these also give new examples of masas for which Popa's invariant \( \delta(\cdot) \) is 1. We also explore the connection between Popa's invariant and strong singularity.
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