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"The existence of free ultrafilters on ω does not imply the extension ..."
Eric J. Hall, Kyriakos Keremedis, Eleftherios Tachtsis (2013)
- Eric J. Hall, Kyriakos Keremedis, Eleftherios Tachtsis:
The existence of free ultrafilters on ω does not imply the extension of filters on ω to ultrafilters. Math. Log. Q. 59(4-5): 258-267 (2013)
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