Yemon Choi

activity

20062025

most citedApproximate amenability of Schatten classes, Lipschitz algebras and second duals of Fourier algebras

22 citations · 148 across the 40 of their papers we have counts for

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Showing 2006 · math.FAShow all

4 papers · 2 filters

math.FA2006★ 2 cited

Simplicial homology of strong semilattices of Banach algebras

Yemon Choi

Certain semigroups are known to admit a `strong semilattice decomposition' into simpler pieces. We introduce a class of Banach algebras that generalise the $ℓ^{1}$ -convolution alg…

math.FA2006★ 1 cited

Simplicial homology and Hochschild cohomology of Banach semilattice algebras

Yemon Choi

The $ℓ^{1}$ -convolution algebra of a semilattice is known to have trivial cohom ology in degrees 1,2 and 3 whenever the coefficient bimodule is symmetric. We ex tend this result…

math.FA2006★ 2 cited

Injective convolution operators on $ℓ^{\infty} (Γ)$ are surjective

Yemon Choi

Let $Γ$ be a discrete group and let $f \in ℓ^{1} (Γ)$ . We observe that if the natural convolution operator $ρ_{f} : ℓ^{\infty} (Γ) \to ℓ^{i n f t y} (Γ)$ is injective, then f is inver…

math.FA2006★ 13 cited

Biflatness of $ℓ^{1}$ -semilattice algebras

Yemon Choi

Building on an old result of Duncan and Namioka, we show that the $ℓ^{1}$ -convolution algebra of a semilattice $S$ is biflat precisely when $S$ is uniformly locally finite. The…

Simplicial homology of strong semilattices of Banach algebras

Simplicial homology and Hochschild cohomology of Banach semilattice algebras

Injective convolution operators on ℓ∞(Γ) are surjective

Biflatness of ℓ1-semilattice algebras

Injective convolution operators on $ℓ^{\infty} (Γ)$ are surjective

Biflatness of $ℓ^{1}$ -semilattice algebras