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The newtxmath package has something called as smallerops option which when used causes the math largeoperators (other than integrals) to render 20% less than their original font size.

My question is the following: I would like to use smallerops option (in displaymath mode) only for the "Summation" (the default summation symbol is too big). Is this possible?

C.S.
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  • Let me make sure I understand your objective: You wish to reduce the size of the symbol produced by \sum in displaymath mode, but not the size of other large math operators such as \prod and \coprod. Is this correct? – Mico Mar 05 '20 at 07:44
  • You could try \medop{\sum} (requires loading nccmath), which does the same job. Note that if you load mathtools, you should load nccmath first. – Bernard Mar 05 '20 at 08:41
  • @Mico Yes you are absolutely correct. – C.S. Mar 05 '20 at 08:48

1 Answers1

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To achieve your objective, i.e., to get a smaller \sum symbol while leaving the sizes of \prod, \coprod and others unchanged, it suffices to copy l. 1327 from newtxmath.sty into the preamble of your document. (I'm currently using version 1.624 of newtxmath.sty, dated 2020/01/25.)

enter image description here

\documentclass{article}
\usepackage{newtxmath}
\makeatletter  % See l. 1327 in newtxmath.sty:
\re@DeclareMathSymbol{\sumop}{\mathop}{largesymbols}{"50}
\makeatother

\begin{document}
$\displaystyle \sum \prod \coprod$
\end{document}
Mico
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