• Sum: \sum_{0}^{2} or \sum\limits_{0}^{2}

    1
    2
    $\sum_{0}^{2}$
    $\sum\limits_{0}^{2}$

  • Integral: \int_{x}^{2} or \int\limits_{x}^{2}

    1
    2
    $\int_{x}^{2}$
    $\int\limits_{x}^{2}$

Note: When you need in-line formulas, the \sum_{0}^{2} is $\sum_{0}^{2}$,

but the \sum\limits_{0}^{2} is $\sum\limits_{0}^{2}$.