Broken Arrow in Lucida Bright Font

Question

When I attempt to use any kind of "long" arrow in the Lucida Bright font, it ends up coming out broken. For a MWE Consider the following:

\documentclass[10 pt]{article}

\usepackage{amsmath,amssymb}

\usepackage{fontspec}      
\usepackage{unicode-math}  

\setmainfont{Lucida Bright OT}
\setsansfont{Lucida Sans OT}
\setmonofont{Lucida Sans Typewriter OT}

\setmathfont{Lucida Bright Math OT}

\begin{document}

Here is an example of an arrow which looks weird:

\begin{gather}
\widehat{\mathcal{O}_v}\otimes_{\mathcal{O}_v} k\xrightarrow{\approx}\widehat{k}
\end{gather}

here is another example:

\begin{gather}
\varprojlim k[T]/(T^n)
\end{gather}

\end{document}

Answer 1

The \xrightarrow and \varprojlim commands use a minus sign for extending the arrow; in the Lucida Math font this has not the same height as the arrow; you can use a different symbol, though, namely "HORIZONTAL LINE EXTENSION U+23AF", that's available in unicode-math under the name \harrowextender; just redefine \relbar to use it:

\documentclass[10pt]{article}

\usepackage{amsmath}

\usepackage{fontspec}      
\usepackage{unicode-math}  

\setmainfont{Lucida Bright OT}
\setsansfont{Lucida Sans OT}
\setmonofont{Lucida Sans Typewriter OT}

\setmathfont{Lucida Bright Math OT}

\renewcommand{\relbar}{\mathrel{\harrowextender}}

\begin{document}


Here is an example of an arrow which looks weird:
\[
\widehat{\mathcal{O}_v}\otimes_{\mathcal{O}_v} k\xrightarrow{\approx}\widehat{k}
\]
here is another example:
\[
\varprojlim k[T]/(T^n)
\]

\end{document}

By the way, I don't think amssymb does any good with unicode-math.

Answer 2

try this setting:

\usepackage{unicode-math}  
\setmainfont{Lucida Bright OT}
\setsansfont{Lucida Sans OT}
\setmonofont{Lucida Sans Typewriter OT}
\setmathfont{Lucida Bright Math OT}
\setmathfont[range={"2190,"2192,"2212}]{TeXGyrePagellaMath-Regular}

or alternatively to using Pagella

\makeatletter
\ams@def\relbar{\raisebox{-0.35pt}{$-$}}
\makeatother

(after loading amsmath). Here is my complete test example:

\documentclass{article}
\usepackage{amsmath}
\usepackage{unicode-math}  
\setmainfont{Lucida Bright OT}
\setsansfont{Lucida Sans OT}
\setmonofont{Lucida Sans Typewriter OT}
\setmathfont{Lucida Bright Math OT}
\setmathfont[range={"2190,"2192,"2212}]{XITS Math}
%\makeatletter
%\ams@def\relbar{\raisebox{-0.35pt}{$-$}}
%\makeatother

\begin{document}        
\begin{gather}
\widehat{\mathcal{O}_v}\otimes_{\mathcal{O}_v} k\xrightarrow{\approx}\widehat{k}
\end{gather}

\begin{gather}
\varprojlim k[T]/(T^n)
\end{gather}

\end{document}