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arxiv: 1905.05630 · v2 · pith:IHB7NZMEnew · submitted 2019-05-14 · 🧮 math.OA · math.FA· math.GR· math.QA

The Hadamard product in a crossed product C*-algebra

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keywords productalgebracrossedhadamardblocknaturalschuraction
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We show that for a C*-algebra A and a discrete group G with an action of G on A, the reduced crossed product C*-algebra possesses a natural generalization of the convolution product, which we suggest should be named the Hadamard product. We show that this product has a natural Stinespring representation and we lift some known results on block Schur products to this setting, but we also show that the block Schur product is a special case of the Hadamard product in a crossed product algebra.

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