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\begin{document}


\begin{abstract}
Es opcional.
\end{abstract}


\maketitle

\section{Sección}

\begin{teo} \label{teo:unomasuno}
$1+1=2$.
\end{teo}
\begin{proof} Ver \cite{ppia}*{Part II, p. 360, $\ast 54 \cdot 43$}.
\end{proof}

Del Teorema \ref{teo:unomasuno} se desprende inmediatamente el siguiente corolario:

\begin{coro}
Se satisfacen las siguientes igualdades:
\begin{enumerate}[(i)]
    \item $1+2=3$;
    \item $2+1=3$.
\end{enumerate}
\qed
\end{coro}

\begin{bibdiv}
\begin{biblist}
\bib{ppia}{book}{
   author={Whitehead, Alfred North},
   author={Russell, Bertrand},
   title={{\it Principia mathematica} to *56},
   series={Cambridge Mathematical Library},
   note={Reprint of the second (1927) edition},
   publisher={Cambridge University Press, Cambridge},
   date={1997},
   pages={xlvi+410},
   isbn={0-521-62606-4},
   doi={10.1017/CBO9780511623585},
}
\end{biblist}
\end{bibdiv}

\end{document}