[texhax] Vertical spacing.

[Rahul Singh]

1.  I have the following theorem environment.
    This environment puts a vertical space of
    ".1 in" after a theorem statement.

    ================================
    \newenvironment{theorem}[1][Theorem]
     {\refstepcounter{theorem}
      \noindent\textbf{\thetheorem \: #1}\quad}
    {\\*[.1in]}
    ================================

2. Some theorem statements have an
   enumerate at the end. An enumerate
   puts some vertical space at the end.

   The following is an example of
   a theorem statement with an enumerate.

   ================================
   \begin{theorem}
    Let $(x_n) \rightarrow x \in \R$ and
        $(y_n) \rightarrow y \in \R$.
    \begin{enumerate}
     \item[(a)] $(x_n + y_n) \rightarrow x + y$.
     \item[(b)] $(x_n - y_n) \rightarrow x - y$.
     \item[(c)] $(x_n \, y_n) \rightarrow x \, y$.
     \item[(d)] $(c \, y_n) \rightarrow c \, y$, $c \in \R$.
     \item[(e)] Let $y \neq 0 \neq y_n$, for every $n \in \N$.
                $\left( \frac{x_n}{y_n} \right) = \frac{x}{y}$.
    \end{enumerate}
   \end{theorem}
  ==================================

3. The above theorem statement gives the error

   ================================
   ! LaTeX Error: There's no line here to end.

   See the LaTeX manual or LaTeX Companion for explanation.
   Type  H <return>  for immediate help.
    ...

   l.2649 \end{theorem}
   ================================


4. I would like to remove the error in such a
   way that the vertical space after a theorem
   statement is ".1 in" independent of the
   last latex statement in theorem statement.

References that explain these kind of issues
will be helpful.


Thank you very much.

Rahul Singh