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\newcommand{\bigrule}{\titlerule[0.5mm]}

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% renombramiento

\addto\captionsspanish{\def\tablename{Tabla}}

\addto\captionsspanish{\def\listfigurename{\'Indice de
gr\'{a}ficos}}

\addto\captionsspanish{\def\contentsname{\'Indice}}

\addto\captionsspanish{\def\listtablename{\'Indice de tablas}}

\addto\captionsspanish{\def\figurename{Gr\'{a}fico}}

\addto\captionsspanish{\def\tablename{Tabla}}

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\newtheorem{defi}{Definición}[section]
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\newtheorem{teo}{Teorema}[chapter]
\newenvironment*{teorema}{\begin{teo}\sffamily\scshape\small}{\hfill$\square$\end{teo}}

\newtheorem{proposition}{Proposición}[section]
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\newtheorem{coro}{Corolario}[section]
\newenvironment*{corolario}{\begin{coro}\sffamily\scshape\small}{\hfill$\square$\end{coro}}

\newtheorem{lem}{Lema}[section]
\newenvironment*{lema}{\begin{lem}\sffamily\scshape\small}{\hfill$\square$\end{lem}}

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\newtheorem{demostracion}{Demostración}[section]
\newenvironment*{demo}{\begin{demostracion}\rmfamily\itshape}{\hfill c.q.d.\end{demostracion}}

\newtheorem{obs}{Observación}[section]
\newenvironment*{observacion}{\begin{obs}\rmfamily\itshape}{\hfill$\square$\end{obs}}

\newtheorem{marca}{Nota}[section]
\newenvironment*{nota}{\begin{marca}\rmfamily\itshape}{\hfill$\square$\end{marca}}

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\newtheorem{ejem}{Ejemplo}[section]
\newenvironment*{ejemplo}{\begin{ejem}\sffamily\upshape}{\hfill$\sharp$\end{ejem}}

\newtheorem{ejer}{Ejercicio}[section]
\newenvironment*{ejercicio}{\begin{ejer}\sffamily\upshape}{\hfill$\sharp$\end{ejer}}

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\newtheorem{propiedad}{Propiedades}[section]
\newenvironment*{propiedades}{\begin{propiedad}\rmfamily\upshape}{\end{propiedad}}

\newtheorem{caracter}{Características}[section]
\newenvironment*{caracteristicas}{\begin{caracter}\rmfamily\upshape}{\end{caracter}}

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