Quantifier
This is an old revision of this page, as edited by Foxtrot (talk | contribs) at 05:25, January 14, 2008. It may differ significantly from current revision.
A quantifier is a logical operator which bounds a variable. Every quantifier must apply to some variable. Some examples of quantifiers include <math>\forall, \exists, \exists^\infty, \exists !, \exists^{=n}, Q, \star, \Box, \Diamond,</math> and <math>\Delta^\sharp</math>. These roughly correspond to natural language quantifiers such as "all", "some", "exists finitely many", "probably exists".