The error function is

The complementary error function is erfc(x) = 1 - erf(x). Dawson's function is

The Fresnel integrals are

and

They are related to the error function by

Visual Numerics, Inc. Visual Numerics - Developers of IMSL and PV-WAVE http://www.vni.com/ PHONE: 713.784.3131 FAX:713.781.9260