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When is there a discontinuous homomorphism from L¹(G)?

Volker Runde (1994)

Studia Mathematica

Let A be an A*-algebra with enveloping C*-algebra C*(A). We show that, under certain conditions, a homomorphism from C*(A) into a Banach algebra is continuous if and only if its restriction to A is continuous. We apply this result to the question in the title.

Wiener's inversion theorem for a certain class of *-algebras

Tobias Blendek (2014)

Colloquium Mathematicae

We generalize Wiener's inversion theorem for Fourier transforms on closed subsets of the dual group of a locally compact abelian group to cosets of ideals in a class of non-commutative *-algebras having specified properties, which are all fulfilled in the case of the group algebra of any locally compact abelian group.

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