Hello, Is the following intended behavior? Maxima 5.18.1 http://maxima.sourceforge.net Using Lisp ECL 9.4.1 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) integrate(exp(-x^(%i)),x,0,1); Is %i an integer? --Mike