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If we want to write big \sum symbol, we can write $\sum\limits_{i=1}^n x_i$.

I want to do similar thing for \natural symbol which will be used to denote the boundary connected sum.

How can I do this?

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Welcome to TeX.SE. – Peter Grill Oct 19 '11 at 21:44
up vote 7 down vote accepted

Saying \limits does not increase the size of the summation symbol, it just moves the limits.

$\sum\limits_{i=1}^n$ \quad $\sum_{i=1}^n$ \quad

If you want to do the same with the \natural symbol you need to use \mathop.

$\natural_{i=1}^n$ \quad $\mathop\natural\limits_{i-1}^n$

If you actually want a larger \natural you can create one with \large, \Large, etc.

\[ \mathop{\hbox{\Large$\natural$}}\limits_{i=1}^n \natural \]

You could also use \scalebox from the graphicx package.

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Here are examples in the four styles (the \sum is for comparison; load amsmath for correctly scaling the big operators in script styles)

enter image description here

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