[Math] Standard notation for sum of vector elements

Question

I can think of multiple ways of writing the sum of a vector $\mathbf{v}$'s elements, but is there a standard operator for this?

Using "programming" notation it is typically sum($v$), but this seems informal. Perhaps just $\mathbf{1}^T \mathbf{v}$ or $\mathbf{1} \cdot \mathbf{v}$?

Answer 1

$\sum_{i=1}^n v_i$ is the most widely accepted and understood notation.