Idempotent ultrafilters without Zorn's Lemma
classification
🧮 math.LO
keywords
idempotentlemmaultrafilterswithoutzornadditiveassumescontinuum
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We introduce the notion of additive filter and present a new proof of the existence of idempotent ultrafilters on N without any use of Zorn's Lemma, and where one only assumes the Ultrafilter Theorem for the continuum.
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