The alternating series test is used to test for convergence when the terms of the underlying sequence alternate. Interactive calculus applet.

This page explores the power series, which is one where the terms of a sequence being summed are power functions. Interactive calculus applet.

A series is the sum of some set of terms of a sequence. For example, the sequence 2, 4, 6, 8, ... has partial sums of 2, 6, 12, 20, ... These partial sums are each a finite series. Interactive calculus applet.