Consider the curve C = {(x, y) E R?: x - y3 = 0}. Let o: R → R be defined by o(t) = t3, then o is a bijection from R to R and so it has an inverse o-1. The equation that defines C can be written as a = ¢(y), and by applying o-1 on both sides we obtain the equivalent equation y = 0-(x). Therefore y is a function of r. Taking this into account, differentiating the equation y3 with respect to a on both sides yields 1 = 3y?. %3D 2 dy Since (0, 0) E C, plugging in r = 0 da %3D and y = 0 into the last equation yields 1 = 0. (a) Explain the mistake(s) in the above argument. (b) Explain why the Implicit. Function Theorem cannot be used to fix the above argument.
Consider the curve C = {(x, y) E R?: x - y3 = 0}. Let o: R → R be defined by o(t) = t3, then o is a bijection from R to R and so it has an inverse o-1. The equation that defines C can be written as a = ¢(y), and by applying o-1 on both sides we obtain the equivalent equation y = 0-(x). Therefore y is a function of r. Taking this into account, differentiating the equation y3 with respect to a on both sides yields 1 = 3y?. %3D 2 dy Since (0, 0) E C, plugging in r = 0 da %3D and y = 0 into the last equation yields 1 = 0. (a) Explain the mistake(s) in the above argument. (b) Explain why the Implicit. Function Theorem cannot be used to fix the above argument.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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