#LyX 2.4 created this file. For more info see https://www.lyx.org/
\lyxformat 620
\begin_document
\begin_header
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\usepackage{ifpdf}

\ifpdf

\usepackage[colorlinks=true,
 pdftitle=Formelnummerierung, pdfpagemode=none,
 pdfpagelayout=OneColumn, pdfstartview=XYZ,
 pdfauthor={Uwe Stöhr},
 pdfsubject={LaTeX/LyX numbering example},
 pdfkeywords={LaTeX, numbering, LyX}]{hyperref}

\else % if DVI

\usepackage[colorlinks=true]{hyperref}

\fi

% define Roman counter
\newcounter{rom}
\renewcommand{\therom}{\roman{rom}}

% remember the original counter
\newcommand{\c@org@eq}{}
\let\c@org@eq\c@equation
\newcommand{\org@theeq}{}
\let\org@theeq\theequation

% \setrom activates the Roman counter
\newcommand{\setrom}{
  \let\c@equation\c@rom
  \let\theequation\therom}

% \setarab activates the original Arabic counter
\newcommand{\setarab}{
  \let\c@equation\c@org@eq
  \let\theequation\org@theeq}
% Added by lyx2lyx
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\setlength{\parindent}{0pt}
\end_preamble
\use_default_options false
\maintain_unincluded_children no
\language spanish
\language_package default
\inputencoding utf8
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\font_roman "default" "default"
\font_sans "default" "default"
\font_typewriter "default" "default"
\font_math "auto" "auto"
\font_default_family default
\use_non_tex_fonts false
\font_sc false
\font_roman_osf false
\font_sans_osf false
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\end_header

\begin_body

\begin_layout Standard
Este documento muestra el uso de dos categorías diferentes de ecuaciones.
 Una está numerada en arábigos,
 la otra en romanos.
\end_layout

\begin_layout Standard
\begin_inset Formula 
\begin{equation}
A=B\label{eq:B}
\end{equation}

\end_inset


\begin_inset Formula 
\begin{equation}
A=C\label{eq:C}
\end{equation}

\end_inset


\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
setrom
\end_layout

\end_inset


\begin_inset Formula 
\begin{equation}
A=D\label{eq:D}
\end{equation}

\end_inset


\begin_inset Formula 
\begin{equation}
A=E\label{eq:E}
\end{equation}

\end_inset


\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
setarab
\end_layout

\end_inset


\begin_inset Formula 
\begin{equation}
A=F\label{eq:F}
\end{equation}

\end_inset


\begin_inset Formula 
\begin{equation}
A=G\label{eq:G}
\end{equation}

\end_inset


\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
setrom
\end_layout

\end_inset


\begin_inset Formula 
\begin{equation}
A=H\label{eq:H}
\end{equation}

\end_inset


\begin_inset Formula 
\begin{equation}
A=I\label{eq:I}
\end{equation}

\end_inset


\end_layout

\begin_layout Standard
Referencias cruzadas:
 
\begin_inset CommandInset ref
LatexCommand eqref
reference "eq:B"
nolink "false"

\end_inset

 ,
 
\begin_inset CommandInset ref
LatexCommand eqref
reference "eq:C"
nolink "false"

\end_inset

 ,
 
\begin_inset CommandInset ref
LatexCommand eqref
reference "eq:F"
nolink "false"

\end_inset

 ,
 
\begin_inset CommandInset ref
LatexCommand eqref
reference "eq:G"
nolink "false"

\end_inset

 ,
 
\begin_inset CommandInset ref
LatexCommand eqref
reference "eq:D"
nolink "false"

\end_inset

 ,
 
\begin_inset CommandInset ref
LatexCommand eqref
reference "eq:E"
nolink "false"

\end_inset

 ,
 
\begin_inset CommandInset ref
LatexCommand eqref
reference "eq:H"
nolink "false"

\end_inset

 ,
 
\begin_inset CommandInset ref
LatexCommand eqref
reference "eq:I"
nolink "false"

\end_inset


\end_layout

\begin_layout Standard
\noindent
\begin_inset CommandInset line
LatexCommand rule
offset "0.5ex"
width "100line%"
height "1pt"

\end_inset


\begin_inset VSpace medskip
\end_inset

Para escribir este ejemplo,
 primero hay que definir un contador para las fórmulas numeradas en romanos.
 Para ello se inserta lo siguiente en el preámbulo \SpecialChar LaTeX
:
\end_layout

\begin_layout Standard

\series bold

\backslash
newcounter{rom}
\begin_inset Newline newline
\end_inset


\backslash
renewcommand{
\backslash
therom}{
\backslash
roman{rom}}
\end_layout

\begin_layout Standard
\begin_inset Newpage newpage
\end_inset

Para guardar el valor del contador arábigo 
\series bold
equation
\series default
,
 se añade al preámbulo lo siguiente
\end_layout

\begin_layout Standard

\series bold

\backslash
newcommand{
\backslash
c@org@eq}{}
\begin_inset Newline newline
\end_inset


\backslash
let
\backslash
c@org@eq
\backslash
c@equation
\begin_inset Newline newline
\end_inset


\backslash
newcommand{
\backslash
org@theeq}{}
\begin_inset Newline newline
\end_inset


\backslash
let
\backslash
org@theeq
\backslash
theequation
\end_layout

\begin_layout Standard
Para poder alternar en el documento entre ambos esquemas de numeración,
 se definen los siguientes comandos en el preámbulo:
\end_layout

\begin_layout Standard

\series bold

\backslash
newcommand{
\backslash
setrom}{
\backslash
let
\backslash
c@equation
\backslash
c@rom
\backslash
let
\backslash
theequation
\backslash
therom}
\end_layout

\begin_layout Standard
para la numeración romana y
\end_layout

\begin_layout Standard

\series bold

\backslash
newcommand{
\backslash
setarab}{
\backslash
let
\backslash
c@equation
\backslash
c@org@eq
\backslash
let
\backslash
theequation
\backslash
org@theeq}
\end_layout

\begin_layout Standard
para la numeración arábiga.
\end_layout

\begin_layout Standard
Cada fórmula será numerada en arábigos por defecto.
 Para cambiar a numeración en romanos,
 se inserta el comando 
\series bold

\backslash
setrom
\series default
 en modo \SpecialChar TeX
.
 Con el comando 
\series bold

\backslash
setarab
\series default
 la numeración retorna a números arábigos.
\end_layout

\end_body
\end_document