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Date: 24-10-2018
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A branch point of an analytic function is a point in the complex plane whose complex argument can be mapped from a single point in the domain to multiple points in the range. For example, consider the behavior of the point under the power function
(1) |
for complex non-integer , i.e., with . Writing and taking from 0 to gives
(2) |
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(3) |
so the values of at and are different, despite the fact that they correspond to the same point in the domain.
Branch points whose neighborhood of values wrap around the range a finite number of times as varies from 0 to correspond to the point under functions of the form and are called algebraic branch points of order . A branch point whose neighborhood of values wraps around an infinite number of times occurs at the point under the function and is called a logarithmic branch point. Logarithmic branch points are equivalent to logarithmic singularities.
Pinch points are also called branch points.
It should be noted that the endpoints of branch cuts are not necessarily branch points.
REFERENCES:
Arfken, G. Mathematical Methods for Physicists, 3rd ed. Orlando, FL: Academic Press, pp. 397-399, 1985.
Morse, P. M. and Feshbach, H. Methods of Theoretical Physics, Part I. New York: McGraw-Hill, pp. 391-392 and 399-401, 1953.
Trott, M. The Mathematica GuideBook for Programming. New York: Springer-Verlag, pp. 188-191, 2004. http://www.mathematicaguidebooks.org/.
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اكتشاف أكبر مرجان في العالم قبالة سواحل جزر سليمان
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