EXISTS_NOT_CONV : conv

SYNOPSIS
Moves an existential quantification inwards through a negation.

DESCRIBE
When applied to a term of the form ?x.~P, the conversion EXISTS_NOT_CONV returns the theorem:
   |- (?x.~P) = ~(!x. P)

FAILURE
Fails if applied to a term not of the form ?x.~P.

SEEALSO  FORALL_NOT_CONV,   NOT_EXISTS_CONV,   NOT_FORALL_CONV

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