Using CVS Maxima + Clozure CL 1.5-dev-r13521M-trunk, I get a Lisp error for zeta(3),numer: (%i1) zeta(3); (%o1) zeta(3) (%i2) %,numer; Maxima encountered a Lisp error: There is no applicable method for the generic function: #<STANDARD-GENERIC-FUNCTION BIGFLOAT:EPSILON #xC2B9586> Barton