MK_PEXISTS : (thm -> thm)
STRUCTURE
PairRules
LIBRARY
pair
SYNOPSIS
Existentially quantifies both sides of a universally quantified equational theorem.
DESCRIPTION
When applied to a theorem A |- !p. t1 = t2, the inference rule MK_PEXISTS returns the theorem A |- (?x. t1) = (?x. t2). 
       A |- !p. t1 = t2
   --------------------------  MK_PEXISTS
    A |- (?p. t1) = (?p. t2)

FAILURE
Fails unless the theorem is a singly paired universally quantified equation.
SEEALSO
PEXISTS_EQ, PGEN, LIST_MK_PEXISTS, MK_PABS
HOL  Kananaskis-14