SCIENCE AND SANITY - online book

An Introduction To Non-aristotelian Systems And General Semantics.

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SEMANTICS OF THE DIFFERENTIAL CALCULUS 587
From the above considerations we see that the differential calculus gives, by the application of some extremely simple structural principles, a method of analysis by which we can discover a tendency at a particular stage rather than the final outcome after a definite interval. From such fundamental yet simple beginnings the whole calculus is developed. Most of these developments are not needed for our purpose, but we will explain one specially important theorem. The theorem in question is that the derivative of the sum of two functions is equal to the sum of their derivatives. In symbols