4

MWE:

\documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage[margin=3cm]{geometry}
\begin{document}
\paragraph*{Problem 1}
This problem can be modelled as a clamped-free cantilever with a point load at the end. Thus, the following boundary conditions can be assigned:
\begin{alignat}{2}
\underline{\emph{Clamped end:}}& &\underline{\emph{Free end:}}&\nonumber \\
w(0) &= 0\quad\textnormal{(no deflection)}\quad\quad\quad & w''(L) &= 0\quad\textnormal{(no moment)}\nonumber \\
w'(0) &= 0\quad\textnormal{(no slope)}\quad\quad\quad & w'''(L) &= 0\quad\textnormal{(no shear force)}\nonumber
\end{alignat}
The boundary condition concerning the shear force at $ x=L $ is a matter of taste, since there is a discontinuity in the shear force in this point.
\end{document}

Producing this: I want a box surrounding the boundary conditions

I would like a box similar to the one produced by \boxed{} around all the boundary conditions stated (including the underlined text). I've looked around on similar questions but it always seems like a special solution for that particular problem - what's the easiest way to do this?

4
  • Thanks. I know the general rule says "avoid mixing underlining, bold, and italics", but I think it looks nice in this case. How would you present these BC's to make it look nice? One can also argue about the alignment of the text to the equations below... Nov 1, 2014 at 18:59
  • No, it looks awful, if I can speak frankly.
    – egreg
    Nov 1, 2014 at 19:01
  • Really? Can you somehow share how you would present it nicely? Maybe add another answer or edit the one you made. Nov 1, 2014 at 19:05
  • Actually I don't think I will include the box anyway, but it's nice to know. Nov 1, 2014 at 19:06

2 Answers 2

7

It's a simple application of empheq

\documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath,empheq}
\usepackage[margin=3cm]{geometry}
\begin{document}
\paragraph*{Problem 1}
This problem can be modelled as a clamped-free cantilever with a point load at the end. Thus, the following boundary conditions can be assigned:
\begin{empheq}[box=\fbox]{alignat=2}
\underline{\emph{Clamped end:}}& &\underline{\emph{Free end:}}&\nonumber \\
w(0) &= 0\quad\textnormal{(no deflection)}\quad\quad\quad & w''(L) &= 0\quad\textnormal{(no moment)}\nonumber \\
w'(0) &= 0\quad\textnormal{(no slope)}\quad\quad\quad & w'''(L) &= 0\quad\textnormal{(no shear force)}\nonumber
\end{empheq}
The boundary condition concerning the shear force at $ x=L $ is a matter of taste, since there is a discontinuity in the shear force in this point.
\end{document}

enter image description here

2
  • I was going to answer this using a minipage. I wasn't even aware of this package. So nice and clean.
    – A.Ellett
    Nov 1, 2014 at 18:03
  • @egreg: Defining a \widebox as, say, \fbox{\quad#1\quad} would look better, I think. Also, needless to load amsmath: empheq does it.
    – Bernard
    Nov 1, 2014 at 19:23
3

A possible option with hf-tikz:

\documentclass[11pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage[margin=3cm]{geometry}
\usepackage[norndcorners,customcolors]{hf-tikz}
\tikzset{set border color=black,set fill color=white}
\begin{document}
\paragraph*{Problem 1}
This problem can be modelled as a clamped-free cantilever with a point load at the end. Thus, the following boundary conditions can be assigned:
\begin{alignat}{2}\tikzmarkin{a}
\underline{\emph{Clamped end:}}& &\underline{\emph{Free end:}}&\nonumber \\
w(0) &= 0\quad\textnormal{(no deflection)}\quad\quad\quad & w''(L) &= 0\quad\textnormal{(no moment)}\nonumber \\
w'(0) &= 0\quad\textnormal{(no slope)}\quad\quad\quad & w'''(L) &= 0\quad\textnormal{(no shear force)}\nonumber\tikzmarkend{a}
\end{alignat}
The boundary condition concerning the shear force at $ x=L $ is a matter of taste, since there is a discontinuity in the shear force in this point.
\end{document}

The result:

enter image description here

1

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