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21: 1.10 Functions of a Complex Variable
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►A cut domain is one from which the points on finitely many nonintersecting simple contours (§1.9(iii)) have been removed.
Each contour is called a cut.
A cut neighborhood is formed by deleting a ray emanating from the center.
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►(a) By introducing appropriate cuts from the branch points and restricting to be single-valued in the cut plane (or domain).
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22: 4.15 Graphics
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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).
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23: 6.3 Graphics
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24: 10.42 Zeros
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►The distribution of the zeros of in the sector in the cases is obtained on rotating Figures 10.21.2, 10.21.4, 10.21.6, respectively, through an angle so that in each case the cut lies along the positive imaginary axis.
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25: 11.3 Graphics
26: 10.3 Graphics
27: 10.2 Definitions
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►The principal branch of corresponds to the principal value of (§4.2(iv)) and is analytic in the -plane cut along the interval .
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►The principal branch corresponds to the principal branches of in (10.2.3) and (10.2.4), with a cut in the -plane along the interval .
►Except in the case of , the principal branches of and are two-valued and discontinuous on the cut
; compare §4.2(i).
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►The principal branches correspond to principal values of the square roots in (10.2.5) and (10.2.6), again with a cut in the -plane along the interval .
►The principal branches of and are two-valued and discontinuous on the cut
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28: 14.23 Values on the Cut
§14.23 Values on the Cut
… ►If cuts are introduced along the intervals and , then (14.23.4) and (14.23.6) could be used to extend the definitions of and to complex . …29: 19.3 Graphics
30: 14.21 Definitions and Basic Properties
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►When is complex , , and are defined by (14.3.6)–(14.3.10) with replaced by : the principal branches are obtained by taking the principal values of all the multivalued functions appearing in these representations when , and by continuity elsewhere in the -plane with a cut along the interval ; compare §4.2(i).
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►Many of the properties stated in preceding sections extend immediately from the -interval to the cut
-plane .
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