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@@ -350,6 +350,10 @@ CLOSED: [2019-01-17 Thu 09:53]
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(defmethod to-sexp ((expression <addition>) &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 <addition>))
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+ (make-instance '<addition>
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+ :terms (mapcar #'copy-expression (slot-value expression 'terms))))
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#+END_SRC
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*** DONE Subtractions
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