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Similar but not the same: various versions of ♣ do not coincide
Published online by Cambridge University Press: 12 March 2014
Abstract
We consider various versions of the ♣ principle. This principle is a known consequence of ◊. It is well known that ◊ is not sensitive to minor changes in its definition, e.g., changing the guessing requirement form “guessing exactly” to “guessing modulo a finite set”. We show however, that this is not true for ♣. We consider some other variants of ♣ as well.
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- Copyright © Association for Symbolic Logic 1999
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