How can I place a two-column equation (a large equation that does not fit in one column) at the bottom of a page?
You can use the multicol package. Either you end a multicol environment before the equation and restart it after, or you define an environment like this:
\documentclass[parskip]{scrartcl}
\usepackage[margin=15mm]{geometry}
\usepackage{multicol}
\usepackage{lipsum}
\pagestyle{empty}
\newcommand{\OneColEqu}[1]{%
\end{multicols}%
\begin{equation}%
#1
\end{equation}%
\begin{multicols}{2}%
}
\begin{document}
\begin{multicols}{2}
\lipsum[1]
\end{multicols}
\begin{equation}
\int\limits_{x=0}^{x=5}(x^2+2x-3) dx = \left[ \frac{1}{3}x^3+x^2-3x+C \right]^{x=5}_{x=0} = \frac{125}{3}+25-15+C-C= \frac{155}{3}
\end{equation}
\begin{multicols}{2}
\lipsum[2]
\OneColEqu{\int\limits_{x=0}^{x=5}(x^2+2x-3) dx = \left[ \frac{1}{3}x^3+x^2-3x+C \right]^{x=5}_{x=0} = \frac{125}{3}+25-15+C-C= \frac{155}{3}}
\lipsum[3]
\end{multicols}
\end{document}
Both approches yield the same, but the own command probably is more convineant:
Edit 1: Putting the equation always on the bottom can be achieved by defining a custom float with the float package:
\documentclass[parskip]{scrartcl}
\usepackage[margin=15mm]{geometry}
\usepackage{multicol}
\usepackage{float}
\usepackage{lipsum}
\pagestyle{empty}
\floatstyle{plain}
\newfloat{twocolequfloat}{b}{zzz}
\floatname{twocolequfloat}{Equation}
\newcommand{\OneColEqu}[1]{%
\end{multicols}%
\begin{twocolequfloat}%
\ensuremath{\hfill #1 \hfill}%
\end{twocolequfloat}%
\begin{multicols}{2}%
}
\begin{document}
\begin{multicols}{2}
\lipsum[1-3]
\OneColEqu{\int\limits_{x=0}^{x=5}(x^2+2x-3) dx = \left[ \frac{1}{3}x^3+x^2-3x+C \right]^{x=5}_{x=0} = \frac{125}{3}+25-15+C-C= \frac{155}{3}}
\lipsum[3-7]
\OneColEqu{\int\limits_{x=0}^{x=5}(x^2+2x-3) dx = \left[ \frac{1}{3}x^3+x^2-3x+C \right]^{x=5}_{x=0} = \frac{125}{3}+25-15+C-C= \frac{155}{3}}
\lipsum[8-14]
\OneColEqu{\int\limits_{x=0}^{x=5}(x^2+2x-3) dx = \left[ \frac{1}{3}x^3+x^2-3x+C \right]^{x=5}_{x=0} = \frac{125}{3}+25-15+C-C= \frac{155}{3}}
\lipsum[15]
\end{multicols}
\end{document}
\floatstyle{plain}same stlye as LaTex (no rules around the float)\newfloat{twocolequfloat}{b}{zzz}new float twocolequfloat, which is always aligned bottom, for posiible use inlistof...or something the file .zzz will be written\floatname{twocolequfloat}{Equation}name displaed e.g. if you use labels
Then we use this environment for our math:
\begin{twocolequfloat}%begin environment\ensuremath{\hfill #1 \hfill}%make sure formula set in mathmode, use\hfillto center it\end{twocolequfloat}%end environment
However, the formula will always be set to the bottom of the page. If your text ends after 20% of the page, the formula will be far away.
answered Sep 12 '11 at 22:33
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So you wnat to write text (say two pages), somewhere write a formula, which is automatically moved to the bottom of the nearest apge? – Tom Bombadil Sep 13 '11 at 20:30
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There you go, almost perfect. If you know how to check if the last page is completely filled and conditionally alter the environment... – Tom Bombadil Sep 14 '11 at 0:26
multicols. – N.N. Sep 12 '11 at 12:21\begin{figure*}(which has some limitations, though... they recommend to break the equation across multiple lines instead). The details can be found in the IEEE Author Digital Tool Box, section X-D1. – Count Zero Sep 12 '11 at 13:29