Hi, The following problem was reported to the Sage bug tracker by Paul Zimmermann: http://trac.sagemath.org/sage_trac/ticket/9505 ginsh - GiNaC Interactive Shell (ginac V1.5.7) <snip> Type ?? for a list of help topics. > f = x*y*z^2; y*z^2*x > coeff(f, z^2,1); y*x > coeff(f, x*y,1); 0 I'd greatly appreciate any help fixing this. Cheers, Burcin