Example 29.  The conformal mapping  .
It can be constructed via the Schwarz-Christoffel integral  .
The image of the upper half-plane    is the upper half-plane slit along the segment from  .
Remark. This is Exercise 9 in Section 11.9 and Exercise 3 (ExtraExample 3) in  Section 11.10, and is illustrated in Figure 11.83 and  Figure 11.90.
Hint: Set  .  In the w-plane , and the exterior angles are  .

Details 29.

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