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==A Differential Extension of Propositional Calculus==
==A Differential Extension of Propositional Calculus==
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<p>Fire over water:<br>
<p>Fire over water:<br>
The image of the condition before transition.<br>
The image of the condition before transition.<br>
In the differentiation of things,<br>
In the differentiation of things,<br>
So that each finds its place.</p>
So that each finds its place.</p>
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| align="right" | — ''I Ching'', Hexagram 64, [Wil, 249]
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===Differential Propositions : The Qualitative Analogues of Differential Equations===
===Differential Propositions : The Qualitative Analogues of Differential Equations===