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►Figure 4.15.7 illustrates the conformal mapping of the strip onto the whole -plane cut along the real axis from to and to , where and (principal value).
…Lines parallel to the real axis in the -plane map onto ellipses in the -plane with foci at , and lines parallel to the imaginary axis in the -plane map onto rectangular hyperbolas confocal with the ellipses.
In the labeling of corresponding points is a real parameter that can lie anywhere in the interval .
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►Figure 4.15.13:
(principal value).
There is a branch cut along the real axis from to .
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