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