Jaime E. Villate writes: > (%i3) taylor(li[2](x),x,0,3); > ** error while printing error message ** > `taylor'~a~%~%~m > -- an error. Quitting. To debug this try debugmode(true); Fixed. All formatting operators in merror must be in UC `taylor'~A~%~%~M etc -- Vadim V. Zhytnikov <vvzhy at mail.ru> <vvzhy at netorn.ru>