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@@ -1500,7 +1500,7 @@ Rules are stored rather simply, in a list of cons cells, with the ~CAR~ being th
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(defvar *rules* '())
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#+END_SRC
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-** WORKING Rules [6/9]
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+** WORKING Rules [7/9]
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:PROPERTIES:
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:CREATED: <2016-06-13 Mon 22:52>
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:ID: fdcebadd-b53d-4f59-99a4-4a3782e017a2
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@@ -1647,12 +1647,15 @@ This is quite simple, differentiate each term and add them together. This is ac
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`(+ ,@(map 'list #'(lambda (term) (differentiate term)) terms)))
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#+END_SRC
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-*** TODO Subtractives
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+*** DONE Subtractives
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+CLOSED: [2016-08-20 Sat 13:13]
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:PROPERTIES:
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:CREATED: <2016-06-14 Tue 10:30>
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:ID: 063f61ee-6fd9-4286-9008-9c80ef0985a5
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:END:
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+Following the same pattern as for additives, subtractives map over, deriving each term and prepending the ~-~ symbol to render the derivative of the originally passed subtractive equation.
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+
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#+Caption: Subtractives
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#+Name: sd-subtractives
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#+BEGIN_SRC lisp
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