If I want to make a bar across h I just use \hbar. But what shall I do if I want to make a line across \lambda like on the picture?
PS: I use the the book document class.
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egreg
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oh thansk :-) .. sorry, I didn't see that post - and I have really used google but couldn't find anything. Thansk! – Conrad Kopernikus Jun 12 '14 at 00:02