The document discusses infinite series and the divergence test. It notes that if the limit of the terms does not equal 0 as n approaches infinity, then the series must diverge. For example, the harmonic series of 1/n diverges even though the limit of the terms is 0. The document then discusses power series and lists learning objectives about finding the general term, writing infinite geometric series in sigma notation, and determining if they converge or diverge based on the common ratio.