Autor:	E. C. Milner, Karel Prikry
Rok vydání:	1991
Předmět:	Combinatorics Discrete mathematics Absoluteness Ordered set Countable set Partition (number theory) Discrete Mathematics and Combinatorics Mathematics Theoretical Computer Science
Zdroj:	Discrete Mathematics. 95(1-3):183-191
ISSN:	0012-365X
DOI:	10.1016/0012-365x(91)90336-z
Popis:	TodorÂ?eviÂ? has shown that there is a ccc extension M in which MAÂ?1 + 2Â? = Â?2 holds and also in which the partition relation Â?i Â? (Â?1,Â?)2 holds for every denumerable ordinal Â?. We show that the partition relation for triples Â?1 Â? (Â?2 + 1, 4)3 holds in the model M, and hence by absoluteness this is a theorem in ZFC.
Databáze:	OpenAIRE
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