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@@ -423,6 +423,10 @@ Multiplication is one of the more frequently used expression types, and is, surp
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(defmethod to-sexp ((expression <multiplication>) &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 <multiplication>))
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+ (make-instance '<multiplication>
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+ :terms (mapcar #'copy-expression (slot-value expression 'terms))))
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#+END_SRC
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*** DONE Divisions
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