Calculate the square root of a given complex number, with
non-negative real part, and with a branch cut along the
negative real axis. (That means that csqrt(−1+eps*I)
will be close to I while csqrt(−1−eps*I) will be
close to −I, if eps is a small positive real
number.)
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Copyright 2002 Walter Harms (walter.harmsinformatik.uni-oldenburg.de)
Distributed under GPL