\hbar is used a lot in physics. Once in a while, one also uses
\lambdabar to mean \lambda/2\pi. It's Unicode description is 'LATIN
SMALL LETTER LAMBDA WITH STROKE' (U+019B).
I've been using this hack
\def\lambdabar{\lambda\kern-1ex\raise0.65ex\hbox{-}}
But it's not beautiful. Is there a better way to get a lambdabar
into (or from) the math fonts? I tried
\def\lambdabar {\Umathchar "0"0"00019B }
by analogy with the definition of \hbar in luatex-math.tex, but it
produces a blank space. There must be no entry for it in the regular
(or Palatino) math fonts.
For reference, the following thread had a discussion about \hbar
<http://www.ntg.nl/pipermail/ntg-context/2013/070810.html>
and \hbar works well (using MkIV 2014.02.14).
-Sanjoy
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