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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | \DOC EXISTENCE
\TYPE {EXISTENCE : (thm -> thm)}
\SYNOPSIS
Deduces existence from unique existence.
\KEYWORDS
rule, unique, existential.
\DESCRIBE
When applied to a theorem with a unique-existentially quantified
conclusion, {EXISTENCE} returns the same theorem with normal existential
quantification over the same variable.
{
A |- ?!x. p
------------- EXISTENCE
A |- ?x. p
}
\FAILURE
Fails unless the conclusion of the theorem is unique-existentially quantified.
\SEEALSO
EXISTS_UNIQUE_CONV.
\ENDDOC
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