Lower-case roman numerals in enumerate with Spanish babel

Question

I want to use lower-case roman numerals in a list, and I used:

%Redefine the first level
\renewcommand{\theenumi}{\Roman{enumi})}
\renewcommand{\labelenumi}{\theenumi}

%Redefine the second level
\renewcommand{\theenumii}{\roman{enumii})}
\renewcommand{\labelenumii}{\theenumii}

But I get upper-case roman numerals for both the first and the second level (I actually get smaller roman numerals for the second level).

Is there a way to use lower-case roman numerals?

Here is an example of the code I used:

\documentclass[letterpaper]{article}

\usepackage[utf8x]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[spanish]{babel}
\usepackage{parskip}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{mathtools}
\usepackage{amssymb}
\usepackage{fullpage}
\usepackage{graphicx}
\DeclareMathOperator{\lcm}{lcm}

\newtheorem{mydef}{Definición}
\newtheorem{theorem}{Teorema}
\newtheorem{lemma}{Lema}
\newtheorem{proposition}[theorem]{Proposición}
\newtheorem{corollary}[theorem]{Corolario}
\newtheorem{remark}{Nota}

%opening
\title{Tarea I}
\author{Pedro
    \and Mateo}
\date{11 de Diciembre de 2013}

\begin{document}

\maketitle

%Redefine the first level
\renewcommand{\theenumi}{\Roman{enumi})}
\renewcommand{\labelenumi}{\theenumi}

%Redefine the second level
\renewcommand{\theenumii}{\roman{enumii})}
\renewcommand{\labelenumii}{\theenumii}

\begin{enumerate}
    \item \
    \begin{enumerate}
        \item Muestre que $\mathbb{Q}(\sqrt[3]{2})$ no tiene automorfismos no triviales.
        \begin{proof}
            Dada la extensión de campos $\mathbb{Q} \subset \mathbb{Q}(\sqrt[3]{2}$
        \end{proof}

    \end{enumerate}
\end{enumerate}


\end{document}

Answer 1

According to the author of the Spanish version of babel lower case roman numerals should not be used when writing in Spanish.

You can find more information about this issue in this blog (in Spanish) and in the babel-spanish manual at page 4 (again, in Spanish).

Lower case roman numerals can be restored via the es-lcroman option, which is documented at the same page of the babel-spanish manual.

The result with \usepackage[spanish,es-lcroman]{babel} in the preamble is the following: