Alternative to bivariate Taylor series

*To*: mathgroup at smc.vnet.net*Subject*: [mg44634] Alternative to bivariate Taylor series*From*: koshi man <man_koshi at yahoo.com>*Date*: Tue, 18 Nov 2003 06:42:09 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Is there any expansion to log(1+exp(x-y)) other than Taylor series in the integer powers of x and y ? I'm trying to find expectation of above function given x, y are random variables with gaussian distributions of known mean and variances. What about other bivariate expansions in Mathematica? CK __________________________________ Do you Yahoo!? Protect your identity with Yahoo! Mail AddressGuard http://antispam.yahoo.com/whatsnewfree