Is there a way to use the fact that a function is odd in the evaluation of an integral? --Martin (%i1) kill(all); (%o0) done (%i1) declare(f, oddfun); (%o1) done (%i2) f(-a) + f(a); (%o2) 0 (%i3) integrate(f(y), y,-a,a); (%o3) integrate(f(y),y,-a,a)