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Tterm

Tterm-kind

Get the kind (tag) of a tterm structure.

Signature
(tterm-kind x) → kind
Arguments: x — Guard (ttermp x).

Definitions and Theorems

Function: tterm-kind$inline

(defun tterm-kind$inline (x)
  (declare (xargs :guard (ttermp x)))
  (let ((__function__ 'tterm-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :variable))
                       :variable)
                      ((eq (car x) :constant) :constant)
                      (t :call))
         :exec (car x))))

Theorem: tterm-kind-possibilities

(defthm tterm-kind-possibilities
  (or (equal (tterm-kind x) :variable)
      (equal (tterm-kind x) :constant)
      (equal (tterm-kind x) :call))
  :rule-classes
  ((:forward-chaining :trigger-terms ((tterm-kind x)))))