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arXiv 0705.4279math.FA
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半格代数的顺从常数

Amenability constants for semilattice algebras

Mahya Ghandehari, Hamed Hatami, Nico Spronk

摘要:

对于任何有限有单位的交换幂等元半群S,一个有单位的半格,我们证明了如何计算它的半群代数l^1(S)的顺从常数,它总是4n+1的形式。然后,我们表明,这些给下界的顺从常数的某些巴拿赫代数分次半格。我们证明了不存在顺从常数在5和9之间的交换半格。

英文摘要:

For any finite unital commutative idempotent semigroup S, a unital semilattice, we show how to compute the amenability constant of its semigroup algebra l^1(S), which is always of the form 4n+1. We then show that these give lower bounds to amenability constants of certain Banach algebras graded over semilattices. We show that there is no commutative semilattice with amenability constant between 5 and 9.

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