erfc - The complementary error function.
erfc computes the complementary error function:
/+oo 2 2 | -t y = ------- | e dt sqrt(pi) | /x y = 1 - erf(x)
erf([0.5,0.2])+erfc([0.5,0.2])
erf , erfcx , calerf ,
W. J. Cody (code from Netlib (specfun))
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