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@@ -701,6 +701,12 @@ The ~<polynomial-term>~ is one of the more interesting types. It's a variable,
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:base (base expression)
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:exponent (exponent expression))))
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+ (defmethod copy-expression ((expression <polynomial-term>))
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+ (make-instance '<polynomial-term>
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+ :coefficient (copy-expression (slot-value expression 'coefficient))
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+ :variable (copy-expression (slot-value expression 'variable))
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+ :exponent (copy-expression (slot-value expression 'exponent))))
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+
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(defmethod update-instance-for-different-class ((prev <polynomial-term>) (current <multiplication>) &key)
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(setf (slot-value current 'terms)
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(terms prev)))
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