Litvinov Sergey <slitvinov <at> gmail.com> writes: > > Why I cannot simplify this? A line is somehow missing from my message taylor(sum ( exp(-x*R[i]), i, 1, 2), x, 0, 1); It works for explicit limit taylor(sum ( exp(-x*R[i]), i, 1, 2), x, 0, 1);