LEFT_OR_EXISTS_CONV : conv
STRUCTURE
SYNOPSIS
Moves an existential quantification of the left disjunct outwards through a disjunction.
DESCRIPTION
When applied to a term of the form (?x.P) \/ Q, the conversion LEFT_OR_EXISTS_CONV returns the theorem:
   |- (?x.P) \/ Q = (?x'. P[x'/x] \/ Q)
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 (?x.P) \/ Q.
SEEALSO
HOL  Kananaskis-13