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Complex Analysis: Lecture 3: branch cuts, complex exponential
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we begin by looking at the sixth root of unity. I mention the utility of this towards solving complex equations and factoring polynomials. I attempt, but fail, to present the solution of the quadratic equation (will add fix later). Then we turn our attention to the problem of finding local inverse functions in the complex domain. To make more sense of what I write for the nth root, solve z^n = w for z ( I did not do this) then you can either use Arg or Arg_alpha generally and this corresponds to various restrictions of the domain. Or, from the multiply-valued viewpoint, the selection of a branch. Then we define the complex exponential and derive the local inverse based on Arg which is denoted Log. The set of all possible solutions to exp(z)=w is denoted log(w). Next class we study the complex power function and the complex trigonometric and hyperbolic functions.
Complex Analysis: Lecture 3: branch cuts, complex exponential
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