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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@1189 a592a061-630c-0410-9148-cb99ea01b6c8
144 lines
2.5 KiB
Plaintext
144 lines
2.5 KiB
Plaintext
#This file was created by <larsbj> Sun Dec 5 17:46:35 1999
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#LyX 1.0 (C) 1995-1999 Matthias Ettrich and the LyX Team
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\lyxformat 2.15
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\textclass article
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\language english
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\inputencoding latin1
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\fontscheme default
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\graphics none
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\paperfontsize 10
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\spacing single
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\papersize letterpaper
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\paperpackage a4
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\use_geometry 0
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\use_amsmath 0
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\paperorientation portrait
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\secnumdepth 3
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\tocdepth 3
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\paragraph_separation indent
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\defskip medskip
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\quotes_language english
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\quotes_times 2
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\papercolumns 0
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\papersides 1
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\paperpagestyle plain
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\layout Title
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Numbering and Labeling equations
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\layout Author
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Alejandro Aguilar-Sierra
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\layout Standard
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A simple equation can be numbered by two ways.
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The first is invocating the LyX command
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\family typewriter
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math-number
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\family default
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.
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The corresponding number
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\begin_float footnote
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\layout Standard
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Or a
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\series bold
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#
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\series default
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mark since true numbering is not yet implemented.
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\end_float
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will appear after the right end of the equation.
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\layout Standard
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\begin_inset Formula
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\begin{equation}
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x=y^{2}-3
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\end{equation}
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\end_inset
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\layout Standard
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Usually the equation number will be referred to in the document.
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It's safer to assign a label to the equation, instead of using a fixed
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number.
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Assigning a label to a non-numbered equation will make it numbered automaticall
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y.
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With the label
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\series bold
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planck
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\series default
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we can be refer to the equation (
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\begin_inset LatexCommand \ref{planck}
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\end_inset
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).
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\layout Standard
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\begin_inset Formula
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\begin{equation}
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\label{planck}
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E=hv
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\end{equation}
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\end_inset
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\layout Standard
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In the case of an equation array, every line is sequentially numbered.
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It's possible to suppress the number for a single line with the command
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\family typewriter
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math-nonumber
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\family default
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.
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The cursor must be at the row you want not to be numbered.
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\layout Standard
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\begin_inset Formula
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\begin{eqnarray}
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(x+y)(x-y) & = & x^{2}-xy+xy-y^{2}\nonumber \\
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& = & x^{2}-y^{2}
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\end{eqnarray}
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\end_inset
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\layout Standard
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It's possible to label more than one line.
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From the following array of equations we can refer to the equations (
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\begin_inset LatexCommand \ref{eq:gs1}
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\end_inset
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) and (
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\begin_inset LatexCommand \ref{eq:gs2}
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\end_inset
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) using their corresponding labels.
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\layout Standard
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\begin_inset Formula
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\begin{eqnarray}
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v_{k+1} & = & w_{k}+b_{1}\label{eq:gs1} \\
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w_{k+1} & = & v_{k+1}+b_{2}
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\end{eqnarray}
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\end_inset
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\layout Standard
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To see the final result please preview or print this document.
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\the_end
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