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NOT_PEXISTS_CONV                                           (PairRules)
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NOT_PEXISTS_CONV : conv

KEYWORDS
conversion, quantifier, existential, negation.

LIBRARY
pair

SYNOPSIS
Moves negation inwards through a paired existential quantification.

DESCRIBE
When applied to a term of the form {~(?p. t)}, the conversion
{NOT_PEXISTS_CONV} returns the theorem:

   |- ~(?p. t) = (!p. ~t)




FAILURE
Fails if applied to a term not of the form {~(?p. t)}.

SEEALSO
Conv.NOT_EXISTS_CONV, PairRules.PEXISTS_NOT_CONV,
PairRules.PFORALL_NOT_CONV, PairRules.NOT_PFORALL_CONV.

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