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Showing 1 to 1 of 1 for “"idempotent ultrafilter"”.
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Ramsey Algebras and Ramsey Spaces
… simple proof of Hindman's theorem using idempotent ultrafilters. We study Ramsey algebras, which are structures that satisfy an analogue of Hindman's theorem. We show the existence of idempotent ultrafilters for Ramsey algebras under Martin's axiom, and the existence of idempotent …