|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||Abstract:||
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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