Check if the unary minus of a value of type
Function:
(defun minus-sint-okp (x) (declare (xargs :guard (and (sintp x)))) (sint-integerp (- (integer-from-sint x))))
Theorem:
(defthm booleanp-of-minus-sint-okp (booleanp (minus-sint-okp x)))
Theorem:
(defthm minus-sint-okp-of-sint-fix-x (equal (minus-sint-okp (sint-fix x)) (minus-sint-okp x)))
Theorem:
(defthm minus-sint-okp-sint-equiv-congruence-on-x (implies (sint-equiv x x-equiv) (equal (minus-sint-okp x) (minus-sint-okp x-equiv))) :rule-classes :congruence)