----------------------------------------------------------------------
OR_EXISTS_CONV                                                  (Conv)
----------------------------------------------------------------------
OR_EXISTS_CONV : conv

SYNOPSIS
Moves an existential quantification outwards through a disjunction.

KEYWORDS
conversion, quantifier, existential, disjunction.

DESCRIBE
When applied to a term of the form {(?x.P) \/ (?x.Q)}, the conversion
{OR_EXISTS_CONV} returns the theorem:

   |- (?x.P) \/ (?x.Q) = (?x. P \/ Q)




FAILURE
Fails if applied to a term not of the form {(?x.P) \/ (?x.Q)}.

SEEALSO
Conv.EXISTS_OR_CONV, Conv.LEFT_OR_EXISTS_CONV,
Conv.RIGHT_OR_EXISTS_CONV.

----------------------------------------------------------------------