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@@ -391,6 +391,10 @@ Subtractions again, contain only a list of terms. However, unlike other types h
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(defmethod to-sexp ((expression <subtraction>) &optional resolve-constants-p)
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`(- ,@(mapcar #'(lambda (exp) (to-sexp exp resolve-constants-p))
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(slot-value expression 'terms))))
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+
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+ (defmethod copy-expression ((expression <subtraction>))
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+ (make-instance '<subtraction>
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+ :terms (mapcar #'copy-expression (slot-value expression 'terms))))
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#+END_SRC
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*** DONE Multiplications
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