# What is sigma notation for an arithmetic series with first term a and common difference d ?

$\left(a + 0 d\right) + \left(a + 1 d\right) + \left(a + 2 d\right) + \left(a + 3 d\right) + \cdots = {\sum}_{n = 0}^{\infty} \left(a + n d\right)$