Re: i need help

*To*: mathgroup at smc.vnet.net*Subject*: [mg26956] Re: i need help*From*: "Paul Lutus" <nospam at nosite.com>*Date*: Tue, 30 Jan 2001 03:38:11 -0500 (EST)*References*: <200101240918.EAA03595@smc.vnet.net> <200101260627.BAA18605@smc.vnet.net> <94vrl8$o90@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

"Vinod Kumar" <vinodkp at bom6.vsnl.net.in> wrote in message news:94vrl8$o90 at smc.vnet.net... > Dear sir, > I need to integrate the following expression > Exp[-M1/a] *Erfc[M2*a^2 -(M3/a^3)]+Exp[M1/a]*Erfc[m2*a^2+(m3/a^3)] > can somebody help me.please. What you need to do first is provide all the required information. 1. Integrate with respect to what variable? 2. Definite or indefinite integration? 3. Numerical or symbolic integration? 4. Variables in your expression are M1,M2,M3,m2,m3 and a. Are m2 and m3 really separate variables or typographical errors? Assuming {m2, m3} == {M2, M3} and indefinite symbolic integration WRT a, Mathematica cannot produce a solution. The presence of Erfc[] probably explains this -- it is known to be soluble only numerically. -- Paul Lutus www.arachnoid.com

**References**:**Fw: FORTRAN style, not OK?***From:*"Toshiyuki \(Toshi\) Meshii" <meshii@mech.fukui-u.ac.jp>

**Re: Fw: FORTRAN style, not OK?***From:*"Carl K. Woll" <carlw@u.washington.edu>