# [Tex/LaTex] Displaying normal size symbols in formula

equations

How can I make the following part of code:

\sum_{i=1}^n \sum_{j=1}^n w_{ij}


in normal size and not in subscript size?

\documentclass[a4paper]{article}
\usepackage[english]{babel}

\begin{document}

$$I = \frac{n}{\sum_{i=1}^n \sum_{j=1}^n w_{ij}} \frac{\displaystyle\sum_{i=1}^n \sum_{j=1}^n w_{ij}(x_i - \bar{x})(x_j - \bar{x})}{\displaystyle\sum_{i=1}^n (x_i - \bar{x})^2}$$

\end{document}


#### Best Answer

You should add a \displaystyle directive in the denominator of the first \frac expression:

\documentclass[a4paper]{article}
\usepackage[english]{babel}
\begin{document}

$$I = \frac{n}{\displaystyle\sum_{i=1}^n \sum_{j=1}^n w_{ij}} \frac{\displaystyle\sum_{i=1}^n \sum_{j=1}^n w_{ij}(x_i - \bar{x})(x_j - \bar{x})}{\displaystyle\sum_{i=1}^n (x_i - \bar{x})^2}$$
\end{document}


Addendum: Technically, without the displaystyle directive, the main elements of expressions in the numerator and denominator of a \frac command that's part of a displayed equation are not in "(sub)script" style but in "text style".