equationssubequations
I'm interested in labelling my latex equation, by giving the physical phenomenon contributing to the term. For instance x = f(y) + g(y). So a horizontal curly bracket to explain that f(y) is derived from some phenomenon, say resistance and g(y) is derived some other phenomenon, say gravity.
How can I give a name to f(y) as resistance and g(y) as gravity in the equation?
Hope I'm able to explain my intentions.
Thank you,
Aditya
For complex drawings (circles, etc), you might need to go the tikz road.
But for simple shading of elements, a regular \colorbox should do, i.e.
\documentclass{article}
\usepackage{xcolor}
\newcommand{\highlight}[1]{%
\colorbox{red!50}{$\displaystyle#1$}}
\begin{document}
\begin{equation}
\mathbf{Y_{ij}} = \highlight{\beta_{0}} +\mathbf{ b_i} + \beta_1x_1 + \ldots + \beta_nx_n + \mathbf{\epsilon_{ij}}
\end{equation}
\end{document}
which yields
In case you want to do more than just highlight terms but are looking to explain the terms, I once wrote the following code for my master's thesis presentation:
\documentclass{article}
\usepackage{xcolor}
\newlength{\overwritelength}
\newlength{\minimumoverwritelength}
\setlength{\minimumoverwritelength}{1cm}
\newcommand{\overwrite}[3][red]{%
\settowidth{\overwritelength}{$#2$}%
\ifdim\overwritelength<\minimumoverwritelength%
\setlength{\overwritelength}{\minimumoverwritelength}\fi%
\stackrel
{%
\begin{minipage}{\overwritelength}%
\color{#1}\centering\small #3\\%
\rule{1pt}{9pt}%
\end{minipage}}
{\colorbox{#1!50}{\color{black}$\displaystyle#2$}}}
\begin{document}
\begin{equation}
\mathbf{Y_{ij}} = \overwrite{\beta_{0}}{very important!} +\mathbf{b_i} + \beta_1x_1 + \ldots + \beta_nx_n + \mathbf{\epsilon_{ij}}
\end{equation}
\end{document}
which this time yields:
You can even easily extend that code to fade the color from slide to slide and highlight one term at a time if you're using beamer (just add a \temporal<+> before the \stackrel, duplicate the \stackrel code three times and change the colors in each variant).
\documentclass{article}
\usepackage{cancel}
\begin{document}
\[
xs'e^x + \cancel{xse^x} + s^2e^{2x} − \cancel{xse^x} = e^{2x},
\]
\end{document}
Best Answer
You have
\underbracefromamsmathand\underbracketfrommathtools(which loads amsmath). I added some horizontal adjustment with the\clapcommand (from mathtools), since the labelled terms are short: