- In logic, a quantifier is an operator that specifies how many individuals in the domain of discourse satisfy an open formula. For instance, the universal quantifier ∀ in the first order formula ∀xP(x) expresses that everything in the domain satisfies the property denoted by P. On the other hand, the existential quantifier ∃ in the formula ∃xP(x) expresses that there exists something in the domain which satisfies that property. A formula where a quantifier takes widest scope is called a quantified formula. A quantified formula must contain a bound variable and a subformula specifying a property of the referent of that variable.
- Scheat (stars.astro.illinois.edu)
SCHEAT (Beta Pegasi). Scheat (she-at), at the northwest corner of the famed Great Square of Pegasus, rises first to announce the coming appearance of the constellation of the “Winged Horse,” which in mythology Perseus rode to rescue Andromeda.