Definition:Harmonic Sequence/Common Difference

Definition
Let $\left \langle{h_k}\right \rangle$ be the harmonic progression:


 * $a_k = \dfrac 1 {a + k d}$ for $k = 0, 1, 2, \ldots$

The term $d$ is the common difference of $\left \langle{a_k}\right \rangle$.