		Search-engine friendly clone of the ACL2 documentation.

Defun-sk-queries

Defun-sk-quantifier-p

Note that these are in the "ACL2" package.

This is an ordinary std::defenum.

Function: defun-sk-quantifier-p

(defun defun-sk-quantifier-p (x)
  (declare (xargs :guard t))
  (or (eq x 'exists) (eq x 'forall)))

Theorem: type-when-defun-sk-quantifier-p

(defthm type-when-defun-sk-quantifier-p
  (implies (defun-sk-quantifier-p x)
           (if (symbolp x)
               (if (not (equal x 't))
                   (not (equal x 'nil))
                 'nil)
             'nil))
  :rule-classes :compound-recognizer)