NOT_EXISTS_CONV : conv

SYNOPSIS
Moves negation inwards through an existential quantification.

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

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

SEEALSO  EXISTS_NOT_CONV,   FORALL_NOT_CONV,   NOT_FORALL_CONV

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