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Message: [QUOTE="Lane Straatman, post: 2506238"] A lot of them are, but this is exactly the type that would not be: filled with type definitions that ordinary mortals can't remember. sqrt() looks like this in tgmath.h at the dinkumware site: sqrt double sqrt(double x); float sqrt(float x); long double sqrt(long double x); double _Complex sqrt(double _Complex x); float _Complex sqrt(float _Complex x); long double _Complex sqrt(long double _Complex x);The function returns the real square root of x, x^(1/2). I would think double _Complex sqrt(double _Complex x) gives the root in the complex plane we're looking for. [/QUOTE]