Oops... I should have read the docs first :-)
Viktor
-----Original Message-----
From: Barton Willis [mailto:willisb at unk.edu]
Sent: Tuesday, May 20, 2008 2:11 PM
To: Viktor T. Toth; 'Oliver Kullmann'
Cc: maxima at math.utexas.edu
Subject: Re: [Maxima] Lambert W function?
The function "lambert_w" is new to 5.15.0 (thanks due to Raymond and
Stavros).
The solve doesn't know about lambert_w. So far, lambert_w evaluates for
doubles (but not big floats):
(%i5) lambert_w(5.60);
(%o5) 1.392014569377103
(%i6) diff(lambert_w(x),x);
(%o6) %e^(-lambert_w(x))/(lambert_w(x)+1)
(%i9) taylor(lambert_w(x),x,0,4);
(%o9) x-x^2+(3*x^3)/2-(8*x^4)/3+...
Barton