NOT_FORALL_CONV : conv

SYNOPSIS
Moves negation inwards through a universal quantification.

DESCRIBE
When applied to a term of the form ~(!x.P), the conversion NOT_FORALL_CONV returns the theorem:
   |- ~(!x.P) = ?x.~P
It is irrelevant whether x occurs free in P.

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

SEEALSO  EXISTS_NOT_CONV,   FORALL_NOT_CONV,   NOT_EXISTS_CONV

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