Authors: Todorčević, Stevo 
Title: Walks on countable ordinals and selective ultrafilters
Journal: Bulletin, Classe des Sciences Mathematiques et Naturelles, Sciences Mathematiques
Volume: 140
Issue: 35
First page: 65
Last page: 78
Issue Date: 1-Dec-2010
ISSN: 0561-7332
In our previous work we have introduced lters on the set of countable ordinals as invariants to standard characteristics of walks in this domain. In this note we examine their projections to the set of natural numbers.
Keywords: Minimal walks | Ordinal numbers
Publisher: Serbian Academy of Sciences and Arts

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