This chapter is concerned with two matters. First, the concept and use of differential coefficients and the related “ dy/dx ” notation; one of the major general points to be made is that this involves a good deal more than a mere change of notation. Second, the weaknesses in many test book accounts of the simple harmonic equation (some of which weaknesses are directly related to the use and abuse of differential coefficients), and some remedial suggestions.
KeywordsManifold Defend Coord
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