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EXISTS_NOT_CONV                                                 (Conv)
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EXISTS_NOT_CONV : conv

SYNOPSIS
Moves an existential quantification inwards through a negation.

KEYWORDS
conversion, quantifier, existential, 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
Conv.FORALL_NOT_CONV, Conv.NOT_EXISTS_CONV, Conv.NOT_FORALL_CONV.

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