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Is there a simple way to put all the text in math-mode in footnotesize instead of inserting the command \begin{footnotesize}...\end{footnotesize} every time?

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    Is it the text in mathmode that you want in footnotesize, or the formulæ? – Bernard Jan 25 at 19:34
  • @Bernard the formulae – Eduardo Longa Jan 25 at 20:48
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The math sizes used for a specific text size are specified using \DeclareMathSizes which by default is

 \DeclareMathSizes{5}{5}{5}{5}
 \DeclareMathSizes{6}{6}{5}{5}
 \DeclareMathSizes{7}{7}{5}{5}
 \DeclareMathSizes{8}{8}{6}{5}
 \DeclareMathSizes{9}{9}{6}{5}
 \DeclareMathSizes{\@xpt}{\@xpt}{7}{5}
 \DeclareMathSizes{\@xipt}{\@xipt}{8}{6}
 \DeclareMathSizes{\@xiipt}{\@xiipt}{8}{6}
 \DeclareMathSizes{\@xivpt}{\@xivpt}{\@xpt}{7}
 \DeclareMathSizes{\@xviipt}{\@xviipt}{\@xiipt}{\@xpt}
 \DeclareMathSizes{\@xxpt}{\@xxpt}{\@xivpt}{\@xiipt}
 \DeclareMathSizes{\@xxvpt}{\@xxvpt}{\@xxpt}{\@xviipt}

so at 10pt the active declaration is

 \DeclareMathSizes{\@xpt}{\@xpt}{7}{5}

which says to use 10pt math font 7pt script font and 5pt scriptscript, so in the preamble you could have

 \DeclareMathSizes{10pt}{8}{6}{5}

as \footnotesize is 8pt in the standard classes 10pt default size option.

| improve this answer | |
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    doesn't \footnotesize depend on main font size specified in \documentclass[12 or 10pt]{article}? – user108724 Jan 25 at 20:36
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    @C.F.G yes sure I was following on from having used 10pt for the main font size in the example. I'll add a few words to make it clearer/ – David Carlisle Jan 25 at 20:48

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