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- Picard's theorem states that in any arbitrarily small neighborhood of a singularity isolated essential z0 an analytic function f takes all finite complex values, with one exception, an infinite number of times. Since z = 0 for is an essential isolated singularity of f(z)= e^(1/z); find an infinite number of z in any neighborhood of z = 0 for which f(z) = i. Which is the only exception?. That is, what is the only value that does not take f(z)= e^(1/z)?1. Use the Cauchy-Riemann equations to determine whether f(z) =(y-ix) /( x2+y2) is analytic or not. If analytic, give the domain of analyticity.4 a. Consider the i.v.p x' = t^(2) + cos(x), x(0) = 0. Verify that the hypothesis of Cauchy Picard theorem for a suitable domain D. b. Then estimate the interval of existence of the solution.
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