Mathematics – Logic
Scientific paper
2004-11-05
Mathematics
Logic
18 pages, LaTeX2e
Scientific paper
We investigate the relation of countable closed subsets of the reals with respect to continuous monotone embeddability; we show that there are exactly aleph_1 many equivalence classes with respect to this embeddability relation. This is an extension of Laver's 1971 result, who considered (plain) embeddability, which yields coarser equivalence classes. Using this result we show that there are only countably many different Godel logics.
Beckmann Arnold
Goldstern Martin
Preining Norbert
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