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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | \DOC lhs
\TYPE {lhs : (term -> term)}
\SYNOPSIS
Returns the left-hand side of an equation.
\DESCRIBE
{lhs "t1 = t2"} returns {"t1"}.
\FAILURE
Fails with {lhs} if the term is not an equation.
\SEEALSO
rhs, dest_eq.
\ENDDOC
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