Idempotent ultrafilters without Zorn's Lemma

additive filter and present a new proof of the existence of idempotent ultrafilters on \mathbb{N} without using in its entire power, and where one only assumes the for the .]]>

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Bibliographic Details
Published in:Proceedings of the American Mathematical Society 2018-01, Vol.146 (1), p.397-411
Main Authors: NASSO, MAURO DI, TACHTSIS, ELEFTHERIOS
Format: Article
Language:English
Subjects:
E. LOGIC AND FOUNDATIONS
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Description
Summary:additive filter and present a new proof of the existence of idempotent ultrafilters on \mathbb{N} without using in its entire power, and where one only assumes the for the .]]>
ISSN:0002-9939
1088-6826
DOI:10.1090/proc/13719