I have problems with assume integer. Here is a worksheet yielding a wrong solution. Is there something other than assume(integer)? > restart: > assume(k,integer); > is(k,integer); > is(l,integer); > t1:=int(sin(x)*sin(k*x),x=0..Pi); > t2:=int(sin(x)*sin(l*x),x=0..Pi); > limit(t2,l=1);