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Counterexample vs Undefined - What's the difference?

counterexample | undefined |

As a noun counterexample

is (logic) an exception to a proposed general rule; a specific instance of the falsity of a universally quantified statement.

As an adjective undefined is

lacking a definition or value.

counterexample

English

(wikipedia counterexample)

Noun

(en noun)
  • (logic) An exception to a proposed general rule; a specific instance of the falsity of a universally quantified statement.

    • undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined