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This is the easiest way: \documentclass{article} \usepackage{amsmath} \newcommand{\wbigcup}{\mathop{\widetilde{\bigcup}}\displaylimits} \begin{document} \[ \wbigcup_{i=1}^n A_i \] \end{document} Note that \displaylimits is not really needed, but clarity is important.


4

I would do like the following: % arara: pdflatex \documentclass{article} \usepackage{amssymb} \let\oldvec\vec \renewcommand*{\vec}[1]{\mathbf{#1}} \begin{document} \[\vec{X}_1^\intercal\vec{X}_1^{\vphantom{\intercal}} \qquad \vec{X}_1^2\vec{X}_2^2\] \end{document} Update: The OP asked for a solution without \vphantom{}. The other way ...


1

I found a solution which seems to work: \let\sp^ \catcode`\^=\active \gdef^#1{\sp{\hspace{0.06em} #1}}



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