How to modify \forall so that it places sub/superscripts below/above the "all" symbol? Just like \sum or \int.
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Is this what you want? Taken from my solution here. The \scalerel* command sizes the \forall symbol to match the size of a \sum symbol. Note that \DeclareMathOperator* requires the amsmath package and \scalerel* requires the scalerel package.
\documentclass{article}
\usepackage{amsmath,scalerel}
\DeclareMathOperator{\Forall}{\scalerel{\forall}{\sum}}
\begin{document}
[
\Forall_{n=1}^{\infty} a_n
]
Inline: $\Forall_{n=1}^{\infty} a_n$.
\end{document}
Sandy G
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Doesn't work for me. I am using plain latex;dvips;ps2pdf under a document class provided by a publisher (IUCr). Only sub- and superscript are shown, but not the "all" symbol. There is no empty box; the sub/superscript placement indicates that instead of the symbol there is at most a box of size 0. – Joachim W Jan 10 '24 at 14:12
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Thanks to kind input from @cabohah, here a solution that is not perfect but looks well enough:
\def\Forall{\mathop{\raisebox{-5pt}{\scalebox{2.0}{\ensuremath \forall}}}\limits}
Not perfect because the numeric constants need to be adjusted for given font size.
Joachim W
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\mathop(and\limitsif needed). – cabohah Jan 09 '24 at 13:22\forallinstead of\Big[would work. – cabohah Jan 09 '24 at 15:31\mathop{\forall}\limitsI get the right placement though the "all" symbol is way too small. – Joachim W Jan 09 '24 at 15:53