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Jubjub

Maybe-jubjub-pointp

Recognize Jubjub points and nil.

Signature
(maybe-jubjub-pointp x) → yes/no
Returns: yes/no — Type (booleanp yes/no).

These are optional Jubjub points. Useful, for instance, as results of functions that may return either Jubjub points or an error value.

Definitions and Theorems

Function: maybe-jubjub-pointp

(defun maybe-jubjub-pointp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'maybe-jubjub-pointp))
    (declare (ignorable __function__))
    (or (jubjub-pointp x) (eq x nil))))

Theorem: booleanp-of-maybe-jubjub-pointp

(defthm booleanp-of-maybe-jubjub-pointp
  (b* ((yes/no (maybe-jubjub-pointp x)))
    (booleanp yes/no))
  :rule-classes :rewrite)

Theorem: maybe-jubjub-pointp-when-jubjub-pointp

(defthm maybe-jubjub-pointp-when-jubjub-pointp
  (implies (jubjub-pointp x)
           (maybe-jubjub-pointp x)))