RIGHT_IMP_EXISTS_CONV : conv

SYNOPSIS
Moves an existential quantification of the consequent outwards through an implication.

DESCRIBE
When applied to a term of the form P ==> (?x.Q), the conversion RIGHT_IMP_EXISTS_CONV returns the theorem:
   |- P ==> (?x.Q) = (?x'. P ==> (Q[x'/x]))
where x' is a primed variant of x that does not appear free in the input term.

FAILURE
Fails if applied to a term not of the form P ==> (?x.Q).

SEEALSO  EXISTS_IMP_CONV,   LEFT_IMP_FORALL_CONV

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