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proof-pile / formal /hol /Help /ALL_CONV.doc
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\DOC ALL_CONV
\TYPE {ALL_CONV : conv}
\SYNOPSIS
Conversion that always succeeds and leaves a term unchanged.
\KEYWORDS
conversion, identity.
\DESCRIBE
When applied to a term {`t`}, the conversion {ALL_CONV} returns the
theorem {|- t = t}. It is just {REFL} explicitly regarded as a conversion.
\FAILURE
Never fails.
\USES
Identity element for {THENC}.
\SEEALSO
NO_CONV, REFL.
\ENDDOC