A function that can be used in Formulas.

Syntax and semantics

erfc (x)

compute the complement of the error function

Definition

erfc (x) = 1 − erf (x)

Why isn’t this function superfluous?

Because of floating-point rounding errors: although one might think that erf ic sufficient, erfc is a separate function because erf (x) can be close to 1.

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