Relief of a Function

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the surface u = u(x,y) = ǀf(z)ǀ, where f(z) is a complex function of the complex variable z= x + iy. Two systems of curves are usually drawn on this surface: curves of equal modulus, along which ǀf(z)ǀ is constant, and curves of equal argument, along which arg f(z) is constant.

Figure 1. Relief of sin z

Some of these curves are provided with numbers giving the values of ǀ f(z)ǀ and arg f(z) on the curves. The modular surface of sin z is shown in Figure 1.

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