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clog.3: Add introductory sentence explaining what these functions calculate 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2015-04-12 12:25:28 +02:00
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@ -18,6 +18,10 @@ clog, clogf, clogl \- natural logarithm of a complex number
.sp
Link with \fI\-lm\fP.
.SH DESCRIPTION
These functions calcualte the complex natural logarithm of
.IR z ,
with a branch cut along the negative real axis.
The logarithm
.BR clog ()
is the inverse function of the exponential