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• Std/system/event-name-queries

Function-namep

Recognize symbols that name functions.

Signature

(function-namep x wrld) → yes/no

Arguments

wrld — Guard (plist-worldp wrld).

Returns

yes/no — Type (booleanp yes/no).

This function is enabled because it is meant as an abbreviation. Theorems triggered by this function should be generally avoided.

Definitions and Theorems

Function: function-namep

(defun function-namep (x wrld)
  (declare (xargs :guard (plist-worldp wrld)))
  (let ((__function__ 'function-namep))
    (declare (ignorable __function__))
    (and (symbolp x)
         (function-symbolp x wrld))))

Theorem: booleanp-of-function-namep

(defthm booleanp-of-function-namep
  (b* ((yes/no (function-namep x wrld)))
    (booleanp yes/no))
  :rule-classes :rewrite)