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+.EQ
+delim $$
+.EN
+.TH ERF 3M
+.CT 2 math
+.SH NAME
+erf, erfc \(mi error function
+.SH SYNOPSIS
+.B #include <math.h>
+.PP
+.B double erf(x)
+.br
+.B double x;
+.PP
+.B double erfc(x)
+.br
+.B double x;
+.SH DESCRIPTION
+These functions calculate the error function
+.RI erf( x )
+.if n .ig
+$=~2 pi sup -1/2 int from 0 to x  roman e sup -t sup 2 dt$
+..
+and the complementary error function
+.RI erfc( x )
+.if n .ig
+$=~ 1 - erf( x )$
+..
+\&.
+The error criterion for both
+.I erf
+and
+.I erfc
+is relative.
+.SH DIAGNOSTICS
+There are no error returns.
+.EQ
+delim off
+.EN