Provides the first counterexamples showing algebraic singular functions are not always dense in the ideal of C*-singular functions for certain étale non-Hausdorff groupoids, including a bundle of groups and one from a self-similar action.
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2 Pith papers cite this work. Polarity classification is still indexing.
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2025 2verdicts
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Defines twisted crossed products of Banach algebras via families of representations and proves they form Banach algebras with universal properties; generalizes Packer-Raeburn trick to show L^p-twisted crossed products are stably isometrically isomorphic to untwisted ones.
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Algebraic singular functions are not always dense in the ideal of $C^*$-singular functions
Provides the first counterexamples showing algebraic singular functions are not always dense in the ideal of C*-singular functions for certain étale non-Hausdorff groupoids, including a bundle of groups and one from a self-similar action.