#This file was created by <larsbj> Fri Sep 12 18:47:36 1997
#LyX 0.11 (C) 1995-1997 Matthias Ettrich and the LyX Team
\lyxformat 2.15
\textclass article
\language default
\inputencoding latin1
\fontscheme default
\graphics none
\paperfontsize 10
\spacing single
\papersize letterpaper
\paperpackage a4
\use_geometry 0
\paperorientation portrait
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\defskip medskip
\quotes_language english
\quotes_times 2
\papercolumns 0
\papersides 1
\paperpagestyle plain
\layout Title
Numbering and Labeling equations
\layout Author
Alejandro Aguilar-Sierra
\layout Standard
A simple equation can be numbered by two ways.
The first is invocating the LyX command
\family typewriter
math-number
\family default
.
The corresponding number
\begin_float footnote
\layout Standard
Or a
\series bold
#
\series default
mark since true numbering is not yet implemented.
\end_float
will appear after the right end of the equation.
\layout Standard
\begin_inset Formula
\begin{equation}
\label{}
x=y^{2}-3
\end{equation}
\end_inset
\layout Standard
Usually the equation number will be referred to in the document.
It's safer to assign a label to the equation, instead of using a fixed
number.
Assigning a label to a non-numbered equation will make it numbered automaticall
y.
With the label
\series bold
planck
\series default
we can be refer to the equation (
\begin_inset LatexCommand \ref{planck}
\end_inset
).
\layout Standard
\begin_inset Formula
\begin{equation}
\label{planck}
E=hv
\end{equation}
\end_inset
\layout Standard
In the case of an equation array, every line is sequentially numbered.
It's possible to suppress the number for a single line with the command
\family typewriter
math-nonumber
\family default
.
The cursor must be at the row you want not to be numbered.
\layout Standard
\begin_inset Formula
\begin{eqnarray}
(x+y)(x-y) & = & x^{2}-xy+xy-y^{2}\nonumber \\
& = & x^{2}-y^{2}
\end{eqnarray}
\end_inset
\layout Standard
It's possible to label more than one line.
From the following array of equations we can refer to the equations (
\begin_inset LatexCommand \ref{eq:gs1}
\end_inset
) and (
\begin_inset LatexCommand \ref{eq:gs2}
\end_inset
) using their corresponding labels.
\layout Standard
\cursor 0
\begin_inset Formula
\begin{eqnarray}
v_{k+1} & = & w_{k}+b_{1}\label{eq:gs1} \\
w_{k+1} & = & v_{k+1}+b_{2}
\end{eqnarray}
\end_inset
\layout Standard
To see the final result please preview or print this document.
\the_end
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