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\TYPE {SYM : (thm -> thm)}
\SYNOPSIS
Swaps left-hand and right-hand sides of an equation.
\KEYWORDS
rule, symmetry, equality.
\DESCRIBE
When applied to a theorem {A |- t1 = t2}, the inference rule {SYM} returns
{A |- t2 = t1}.
{
A |- t1 = t2
-------------- SYM
A |- t2 = t1
}
\FAILURE
Fails unless the theorem is equational.
\SEEALSO
GSYM, NOT_EQ_SYM, REFL.
\ENDDOC
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