R6RS has a 2-operand version of the log function:

   (log zi zii) computes the base-zii logarithm of zi.

This function is not in the latest R7RS draft that I've seen,
which means it should be listed in the "Incompatibilities with
the main R6RS document" section of the NOTES.

(Apologies if this is a repeat, but searching for "log" is
difficult.)
--
	--Per Bothner
per@bothner.com   http://per.bothner.com/

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