SWAP_EXISTS_CONV : conv

SYNOPSIS
Interchanges the order of two existentially quantified variables.

DESCRIBE
When applied to a term argument of the form ?x y. P, the conversion SWAP_EXISTS_CONV returns the theorem:
   |- (?x y. P) = (?y x. P)

FAILURE
SWAP_EXISTS_CONV fails if applied to a term that is not of the form ?x y. P.


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