Abstract
We consider various versions of the Clubsuit sign 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 Clubsuit sign. We consider some other variants of Clubsuit sign as well.
Original language | English |
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Pages (from-to) | 180-198 |
Number of pages | 19 |
Journal | Journal of Symbolic Logic |
Volume | 64 |
Issue number | 1 |
DOIs | |
State | Published - Mar 1999 |