**Definition**: A [[Convergent Real Series|convergent series]] that is not [[Absolutely Convergent Series|absolutely convergent]]. **Example**: the [[Alternating Harmonic Series|alternating harmonic series]] is conditionally convergent but not absolutely convergent. ### References - [[Absolutely Convergent Series]] - [[Conditionally convergent series can be arranged to converge to any real number (Reimann Rearrangment Theorem)]]