The Second Derivative of a Polygenic
نویسنده
چکیده
of course then depends not only on the point z but also on the direction of approach 8, that is, on the slope m = y' = dy/dx. The main theorem is that, plotted in the a, ß plane, the locus of points 7, corresponding to a given point z, is a circle (the derivative circlet), or more accurately a suitably parametrized circle, which I have termed a clock (the derivative clock). Various expressions for y are convenient, and are here given for reference :
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