Equation in an unordered list - LaTeX

An item of unordered list can have the equation in display mode. The indentation of an equation in paragraph and item are different.

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
\[ \sum_{k=1}^n = \frac{1}{2} n (n+1) \]
\begin{itemize}
    \item Lorem
    \item ipsum
        \[ \sum_{k=1}^n = \frac{1}{2} n (n+1) \]
    \item dolor
\end{itemize}