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I'd like to create a version of the command \tmb{}{}{} (for stacking 3 pieces of information in the order top, middle, bottom) from egreg's solution here that allows one to use text input as first and third arguments (instead of math formulas; writing \tmb{\text{}}{}{\text{}} repeatedly is tedious). Here's my attempt and what's wrong with it:

\documentclass{scrartcl} \usepackage{amsmath} \usepackage{mathtools} % See https://tex.stackexchange.com/questions/596113/how-to-properly-stack-three-symbols-e-g-symbols-or-text-above-and-below-conver/596116#596116 \makeatletter \newcommand{\tmb}[3]{% \mathrel{% \vbox{\offinterlineskip\m@th \ialign{% \hfil##\hfil\cr $\scriptscriptstyle#1\mathstrut$\cr \noalign{\vspace{0.3ex}} \vtop{% \ialign{% \hfil##\hfil\cr $#2$\cr $\scriptscriptstyle#3\mathstrut$\cr }% }\cr }% }% }% } \makeatother % My trial to define a version that accepts text as 1st and 3rd argument \makeatletter \newcommand{\tmbtext}[3]{% \mathrel{% \vbox{\offinterlineskip\m@th \ialign{% \hfil##\hfil\cr \tiny#1\strut\cr \noalign{\vspace{0ex}} \vtop{% \ialign{% \hfil##\hfil\cr $#2$\cr \tiny#3\strut\cr }% }\cr }% }% }% } \makeatother \begin{document} \begin{alignat*}{2} &\mathclap{\tmb{n=km}{=}{\text{def.}}} \qquad&& \text{... the original version with formulas and text above/below ``$=$''}\\ &\mathclap{\tmbtext{$n=km$}{=}{def.}} \qquad&& \text{... text version, but formula now has too much horizontal space around ``$=$''}\\ &\mathclap{\tmbtext{$\scriptstyle n=km$}{=}{def.}} \qquad&& \text{... fixes the horizontal spacing problem but providing \texttt{scriptstyle} every time is tedious} \end{alignat*} \end{document}

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I'd ideally like to be able to provide text or a formula enclosed in $ $ symbols (just like the second version above), but have the output displayed as in the third version (without the need to manually provide \scriptstyle or other commands). Is that possible?

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  • Sorry, but you contradict yourself. Yesterday you wanted space around relation symbols, today you don't; and you're asking to have text at the top and bottom, then you use $...$. What's your real aim? Commented Apr 24 at 16:22
  • ... indeed, more space in math mode, less in text mode (neither seems to be straightforward and so I settled with the more compact version in math mode - which indeed looked fine in most actual, non-minimal use cases). Commented Apr 25 at 9:01

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I don't see what's the purpose of avoiding \text in one argument, but having $...$ in the other…

Anyway…

\documentclass{scrartcl} \usepackage{amsmath} \usepackage{mathtools} % See https://tex.stackexchange.com/questions/596113/how-to-properly-stack-three-symbols-e-g-symbols-or-text-above-and-below-conver/596116#596116 \makeatletter \newcommand{\tmb}[3]{% \mathrel{% \vbox{\offinterlineskip\m@th \ialign{% \hfil##\hfil\cr $\scriptscriptstyle#1\mathstrut$\cr \noalign{\vspace{0.3ex}} \vtop{% \ialign{% \hfil##\hfil\cr $#2$\cr $\scriptscriptstyle#3\mathstrut$\cr }% }\cr }% }% }% } \newcommand{\tmbtext@aux}[1]{% \fontsize{\ssf@size}{\fpeval{1.2*\ssf@size}}\selectfont\strut \thickmuskip=0mu \medmuskip=0mu #1% } \newcommand{\tmbtext}[3]{% \mathrel{% \vbox{\offinterlineskip\m@th\check@mathfonts \ialign{% \hfil##\hfil\cr \tmbtext@aux{#1}\cr \noalign{\vspace{0.3ex}} \vtop{% \ialign{% \hfil##\hfil\cr $#2$\cr \tmbtext@aux{#3}\cr }% }\cr }% }% }% } \makeatother \begin{document} \begin{gather*} A \tmbtext{aaa}{=}{bbb} B \tmbtext{bbb}{=}{aaa} C \tmbtext{$n=km$}{=}{def.} D \\ A \tmb{\text{aaa}}{=}{\text{bbb}} B \tmb{\text{bbb}}{=}{\text{aaa}} C \tmb{n=km}{=}{\text{def.}} D \end{gather*} \end{document}

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  • Thanks a lot, egreg (I shall not bother you again for some while...). I understand your point \text{} vs $ $, but I have a solid 4-digit number of calls and a vast majority with text, so writing $ $ instead of \text{} is indeed much more convenient. I also wrote a nice wrapper that calls the command with \clap{} around the first and third argument, to get correct vertical alignment of equations with arguments extending beyond the width of =. Thanks again for your great help. Commented Apr 25 at 9:05

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