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The spacing issues you raise may be related more to the Greek letters in use (Gamma, Lambda) than to the occurrence of the "prime" characters. For extra-fine control of math spacing, consider using \mkern with positive or negative amounts of mu instead of \, (positive thinspace, equivalent to \mkern3mu when in math mode) or \! (negative thinspace, ...

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(Too long for a comment, hence posted as an answer of sorts.) I assume you're using a Windows-based computer. When I compile your MWE under Windows 7 and MikTeX 2.9, I get exactly the problem that you report in your posting. That's why I'm guessing you're on a Windows-based system. Now: Is there any chance at all that you could switch to a Mac to compile ...

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The problem has a long history. It was brought up in 2011, as far as I know, with a message to the TeX Live mailing list; the thread went on also in the LuaTeX list. The problem is that LuaTeX doesn't add the italic correction in math mode after characters having category code 11. Indeed, in TeX Live 2011, the output from your code would be the same as you ...

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