Www.math.utah.edu/~carlson/teaching/calculus/series.html. An infinite series is an expression like this: The dots mean that infinitely many terms follow. We obviously can't add up an infinite number of terms, but we can add up the first n terms, like this: It is clear what the pattern is: the n-th partial sum is Sn = 2 - 1/2n. Infinite Series Tutorial. Infinite Series (identify your series here) Return to my Mathematics pagesGo to my home page © Copyright 2002, Jim Loy Note: If your WWW browser cannot display special symbols, like 2, then click here for the alternative Infinite Series page.