Encierra en un círculo dos términos en una ecuación uniéndolos mediante una flecha en látex.

Question

Me gustaría saber si es posible hacer algo así en una ecuación.

mi codigo aqui

\documentclass[12pt]{article}
%\usepackage[english]{babel}
%\usepackage{amsmath,amsthm}
 %\usepackage{amsfonts}
 \usepackage[T1]{fontenc}
\usepackage{mathpazo}
\usepackage{tikz}         
 \usetikzlibrary{arrows}

 \newcommand{\tikzmark}[2]{%
\tikz[remember picture,baseline=(#1.base)]
\node[text=black,anchor=center,inner sep=1pt] (#1) {#2};}


 \begin{document}

$$\tikzmark{a}{a}=\tikzmark{c}{c}$$

\tikz[overlay,remember picture]{\draw[blue,thick,->] (a.north) to [bend left=45] node[anchor=south]{$=$}(c.north);}

\end{document}

No conozco las flechas de dibujo en la parte inferior.

Answer 1

\documentclass[12pt]{article}
 \usepackage[T1]{fontenc}
\usepackage{mathpazo}
\usepackage{tikz}         
 \usetikzlibrary{arrows}

 \newcommand{\tikzmark}[2]{%
\tikz[remember picture,baseline=(#1.base)]
\node[text=black,anchor=center,inner sep=1pt] (#1) {#2};}


 \begin{document}

\[\tikzmark{a}{a}=\tikzmark{c}{c}\]

\tikz[overlay,remember picture]{\draw[blue,thick,->]
   (a.north) to [bend left=45] node[above]{\scriptsize$=$}(c.north);}
\tikz[overlay,remember picture]{\draw[blue,thick,->]
   (a.south) to [bend right=45] node[below]{\scriptsize$=$}(c.south);}

\end{document}

Answer 2

Sin uso tikz:

\documentclass[12pt]{article}
\usepackage[T1]{fontenc}
\usepackage{amsmath,amssymb}

\usepackage{graphics}
\newcommand{\arroweqover}{\substack{\mathstrut \mkern7mu=\\ \scalebox{2.5}{$\mkern4mu\curvearrowright$}}}

\newcommand{\arrowequnder}{\substack{\rotatebox{180}{\scalebox{2.5}{$\mkern-4mu\curvearrowleft$}}\\ \mathstrut\mkern7mu=}}

\begin{document}
\[
 \overset{\arroweqover}{\underset{\arrowequnder}{A=c}} 
\]
\end{document}