Problem with ntheorem, align and \qedhere

Question

I would like to use the align environment inside a proof with ntheorem, but I have trouble with \qedhere.

I was guided by this (https://tex.stackexchange.com/a/2280/30325) code, and replaced \[ by align - please consider this:

\documentclass{article} 
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage[amsmath,amsthm,thmmarks]{ntheorem}
\begin{document}

\begin{proof}   
\begin{align*}
   f(x) & = 1 \\
        & = \frac{22222222222222222222222222222222222222222222222}{22222222222222222222222222222222222222222222222} 
\end{align*}
\end{proof}

\begin{proof}  
\[\frac{22222222222222222222222222222222222222222222222}{22222222222222222222222222222222222222222222222}\] 
\end{proof}  

\end{document}  

which gives

In the align example, \qedhere is placed a bit too high. How can this be fixed?

Answer 1

If manual correction is acceptable...

\documentclass{article} 
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage[amsmath,amsthm,thmmarks]{ntheorem}
\begin{document}

\begin{proof}   
\begin{align*}
   f(x) & = 1 \\
        & = \frac{22222222222222222222222222222222222222222222222}{22222222222222222222222222222222222222222222222}\\[-\baselineskip]
\end{align*}
\end{proof}

\begin{proof}  
\[f(x)=\frac{22222222222222222222222222222222222222222222222}{22222222222222222222222222222222222222222222222}\] 
\end{proof}  

\end{document}