MK_EXISTS : (thm -> thm)

SYNOPSIS
Existentially quantifies both sides of a universally quantified equational theorem.

DESCRIBE
When applied to a theorem A |- !x. t1 = t2, the inference rule MK_EXISTS returns the theorem A |- (?x. t1) = (?x. t2).
       A |- !x. t1 = t2
   --------------------------  MK_EXISTS
    A |- (?x. t1) = (?x. t2)

FAILURE
Fails unless the theorem is a singly universally quantified equation.

SEEALSO  AP_TERM,   EXISTS_EQ,   GEN,   LIST_MK_EXISTS,   MK_ABS

HOL  Kananaskis 0