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21: 1.9 Calculus of a Complex Variable
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►(However, if we require a principal value to be single-valued, then we can restrict
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►That is, given any positive number , however small, we can find a positive number such that for all in the open disk .
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►provided that in both cases is described in the positive rotational (anticlockwise) sense.
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►A set of complex numbers where and take all positive integer values is called a double sequence.
It converges to
if for every , there is an integer such that
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