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On Series of Ordinals and Combinatorics   
摘  要:   This paper deals mainly with generalizations of results in finitary combinatorics to infinite ordinals.It is well-known that for finite ordinalsPfi!fffi is the number of 2-element subsets of an ff-element set. It isshown here that for any well-ordered set of arbitrary infinite order type ff,Pfi!fffi is the ordinal of the set Mof 2-element subsets where M is ordered in some natural way. This result is then extended to evaluating theordinal of the set of all n-element subsets for ...
发  表:   Mathematical Logic Quarterly  1997

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