EXISTENCE

Conv.EXISTENCE : (thm -> thm)

Deduces existence from unique existence.

When applied to a theorem with a unique-existentially quantified conclusion, EXISTENCE returns the same theorem with normal existential quantification over the same variable.

    A |- ?!x. p
   -------------  EXISTENCE
    A |- ?x. p

Failure

Fails unless the conclusion of the theorem is unique-existentially quantified.

See also

Conv.EXISTS_UNIQUE_CONV