Directly finite algebras of pseudofunctions on locally compact groups

Abstract

An algebra $A$ is said to be directly finite if each left invertible element in the (conditional) unitization of $A$ is right invertible. We show that the reduced group ${\mathrm{C}}^{\ast }$-algebra of a unimodular group is directly finite, extending known results for the discrete case. We also investigate the corresponding problem for algebras of $p$-pseudofunctions, showing that these algebras are directly finite if $G$ is amenable and unimodular, or unimodular with the Kunze--Stein property. An exposition is also given of how existing results from the literature imply that $L^1(G)$ is not directly finite when $G$ is the affine group of either the real or complex line.

AMS-LaTeX, 16 pages. v3: some typos corrected from v2; Remark 3.5 also patched. Final version, to appear in the Glasgow Mathematical Journal. v4: two more typos caught by author when reviewing page proofs

References in corpus (1)

• Group representations with empty residual spectrum

Cited by in corpus (3)

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