Autor:	Mauro Di Nasso, Eleftherios Tachtsis
Rok vydání:	2017
Předmět:	Lemma (mathematics) Applied Mathematics General Mathematics Ultrafilter ultrafilter theorem Mathematics::General Topology Algebra on βN idempotent ultrafilters Zorn's lemma Combinatorics Mathematics::Logic Idempotence Algebra on βN idempotent ultrafilters ultrafilter theorem Mathematics
Zdroj:	Proceedings of the American Mathematical Society. 146:397-411
ISSN:	1088-6826 0002-9939
DOI:	10.1090/proc/13719
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d31f60e20370359c7287c8b0f50fe06e https://doi.org/10.1090/proc/13719 Zobrazit plný text záznamu