[Latex] Display subscript under the symbols

Problem

When writing inline equations in LaTeX, symbols such as summations may get ugly with subscripts, for example:

\sum_{i=1} x_i

Solution

Add \displaystyle right before the equation (e. g. $\displaystyle \sum_{i=1} x_i$) to display the subscript under the symbol. Our example becomes

\displaystyle \sum_{i=1} x_i

Reference

[1] http://www.artofproblemsolving.com/Wiki/index.php/LaTeX:Math

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