Drawing arcs under letters

Question

I have been trying to draw something like

Can anyone help me with the code? I have no idea how to do this. Your help would be appreciated.

Edit: Based on comments, I got the code

\documentclass{article}
\usepackage[usenames,dvipsnames]{pstricks} 
\usepackage{pstricks-add}
\usepackage{epsfig}
\usepackage{pst-grad} % For gradients
\usepackage{pst-plot} % For axes
\usepackage[space]{grffile} % For spaces in paths
\usepackage{etoolbox} % For spaces in paths
\makeatletter % For spaces in paths
\patchcmd\Gread@eps{\@inputcheck#1 }{\@inputcheck"#1"\relax}{}{}
\makeatother 
\documentclass{article}
\usepackage{tikz-cd}
\usepackage{amsmath}
\usetikzlibrary{arrows}
\def\ac{\rotatebox[origin=c]{90}{$\dashv$}} %rotate dash anti-cw
\def\cw{\rotatebox[origin=c]{-90}{$\dashv$}} %rotate dash cw
%\tikzset{adj/.style={pos=0.545,outer sep=3pt}} %adjust label position along path
\begin{document}
\begin{tikzcd}[column sep=small]
    q 
& &
    \arrow[bend left,above]{ll}{a} -q 
    %\arrow[bend left,above, adj]{ll}{U_G} Cat \arrow[bend left,below]{rr}{F_P}
& &
  q 
& &
    q^2 
    & & 
    -q^2\arrow[bend left,above]{ll}{b}
    & &
    q^2
    & &
    -q^2\arrow[bend left,above]{ll}{b}
    & & 
    -q
\end{tikzcd}
\end{document}

which gives

But I am not able to draw the big underline.

Welcome to TeX.SX! Questions about how to draw specific graphics that just post an image of the desired result are really not reasonable questions to ask on the site. Please post a minimal compilable document showing that you've tried to produce the image and then people will be happy to help you with any specific problems you may have. See minimal working example (MWE) for what needs to go into such a document. — Imran, Dec 14 '21 at 13:25
There's tikz pgf - Draw arrows to show multiplication pattern (distributive property) - TeX - LaTeX Stack Exchange — and also TikZ: curved arrows with symbol between, problem with centering and tilting - TeX - LaTeX Stack Exchange but that one is quite different. — user202729, Dec 14 '21 at 13:32

score 2 · Accepted Answer · answered Dec 14 '21 at 14:30

Just add another arrow in a similar fashion you have added the ones.

\documentclass{article}
\usepackage{tikz-cd}
\usepackage{amsmath}
\usetikzlibrary{arrows}
\def\ac{\rotatebox[origin=c]{90}{$\dashv$}} %rotate dash anti-cw
\def\cw{\rotatebox[origin=c]{-90}{$\dashv$}} %rotate dash cw
%\tikzset{adj/.style={pos=0.545,outer sep=3pt}} %adjust label position along path
\begin{document}
\begin{tikzcd}[column sep=small]
    q 
& &
    \arrow[bend left,above]{ll}{a} -q 
    %\arrow[bend left,above, adj]{ll}{U_G} Cat \arrow[bend left,below]{rr}{F_P}
& &
   q

& &
    q^2 
    & & 
    -q^2\arrow[bend left,above]{ll}{b}
    & &
    q^2
    & &
    -q^2\arrow[bend left,above]{ll}{b}
    & & 
    \arrow[bend left,above]{llllllllll}{b} % <--- addition
    -q\
    &&  &&&&&\
\end{tikzcd}
\end{document}

If you don't want an arrowhead, use the option dash in the arrow command like this \arrow[dash, bend left].... — Imran, Dec 14 '21 at 14:39

Drawing arcs under letters

1 Answers1