Unary minus of a value of type
Function:
(defun minus-schar (x) (declare (xargs :guard (and (scharp x) (minus-schar-okp x)))) (minus-sint (sint-from-schar x)))
Theorem:
(defthm sintp-of-minus-schar (sintp (minus-schar x)))
Theorem:
(defthm minus-schar-of-schar-fix-x (equal (minus-schar (schar-fix x)) (minus-schar x)))
Theorem:
(defthm minus-schar-schar-equiv-congruence-on-x (implies (schar-equiv x x-equiv) (equal (minus-schar x) (minus-schar x-equiv))) :rule-classes :congruence)