EXISTS_OR_CONV : conv
STRUCTURE
Conv
SYNOPSIS
Moves an existential quantification inwards through a disjunction.
DESCRIPTION
When applied to a term of the form ?x. P \/ Q, the conversion EXISTS_OR_CONV returns the theorem: 
   |- (?x. P \/ Q) = (?x.P) \/ (?x.Q)

FAILURE
Fails if applied to a term not of the form ?x. P \/ Q.
SEEALSO
OR_EXISTS_CONV, LEFT_OR_EXISTS_CONV, RIGHT_OR_EXISTS_CONV
HOL  Kananaskis-14