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Maybe-pseudo-event-formp

Recognize pseudo-event-formp values and nil.

Signature

(maybe-pseudo-event-formp x) → yes/no

Returns

yes/no — Type (booleanp yes/no).

Definitions and Theorems

Function: maybe-pseudo-event-formp

(defun maybe-pseudo-event-formp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'maybe-pseudo-event-formp))
    (declare (ignorable __function__))
    (or (pseudo-event-formp x) (null x))))

Theorem: booleanp-of-maybe-pseudo-event-formp

(defthm booleanp-of-maybe-pseudo-event-formp
  (b* ((yes/no (maybe-pseudo-event-formp x)))
    (booleanp yes/no))
  :rule-classes :rewrite)

Theorem: maybe-pseudo-event-formp-when-pseudo-event-formp

(defthm maybe-pseudo-event-formp-when-pseudo-event-formp
  (implies (pseudo-event-formp x)
           (maybe-pseudo-event-formp x)))