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 July 10th, 2014, 06:21 AM #21 Global Moderator     Joined: Nov 2006 From: UTC -5 Posts: 16,046 Thanks: 938 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms I don't use any type of logs except natural logs, personally -- if I want the base-10 log of x I write $\log x/\log 10.$ Sometimes people write $\log_kx$ to mean $\log\log\cdots\log x$, where there are $k$ logs, and avoiding subscripts for bases is one reason for that.
July 10th, 2014, 07:37 AM   #22
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Quote:
 Originally Posted by CRGreathouse I don't use any type of logs except natural logs, personally -- if I want the base-10 log of x I write $\log x/\log 10.$ Sometimes people write $\log_kx$ to mean $\log\log\cdots\log x$, where there are $k$ logs, and avoiding subscripts for bases is one reason for that.
Haven't thought that much. In fact, this is the first time I see something like that. The closest thing I have seen is $\log^kx$ which means $(log x)^k$ .

July 10th, 2014, 10:14 AM   #23
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Quote:
 Originally Posted by Monox D. I-Fly Haven't thought that much. In fact, this is the first time I see something like that.
It's not that common -- about as rare, IMX, as seeing an explicit base in a research math paper.

Quote:
 Originally Posted by Monox D. I-Fly The closest thing I have seen is $\log^kx$ which means $(log x)^k$ .
That's pretty common.

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