In this introductory video, we define an absolutely convergent series and show that if a series absolutely converges, then it converges. Duration: 8:39

Building on a foundational understanding of an absolutely convergence series, we come to understand just how schizophrenic conditionally convergent series can be. First they sum to ln(2), then they sum to half that. Settle down and make up your mind. Duration: 20:02

Mathlodger explanation of Riemann's Rearrangement Theorem, which basically states that conditionally convergent series can be shown to sum to any conceivable number just by rearranging the terms. This demonstrates that things like the commutative and associative properties are foreign concepts as far as conditionally convergent series goes. Duration: 11:57