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Fix typo in calc.texi
* doc/misc/calc.texi (Programming Tutorial): Fix a typo. Suggested by Vladimir Nikishkin <lockywolf@gmail.com>.
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@ -6217,7 +6217,7 @@ method when it is able. @xref{Programming Answer 8, 8}. (@bullet{})
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@cindex Gamma constant, Euler's
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@cindex Euler's gamma constant
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(@bullet{}) @strong{Exercise 9.} The @dfn{digamma} function
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@texline @math{\psi(z) (``psi'')}
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@texline @math{\psi(z)} (``psi'')
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@infoline @expr{psi(z)}
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is defined as the derivative of
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@texline @math{\ln \Gamma(z)}.
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