My Math Forum Need help with Decoding Math watch

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March 5th, 2014, 06:59 PM   #1
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Joined: Mar 2014

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Need help with Decoding Math watch

Hi,

I figured this would be a good place to get the answer to my question. I need help with decoding the 4 O'clock position of this geek watch (see attachment). It reads -[-pi] (???). If someone could tell me what is this referring to.

Thank you very much.

FMT
Attached Images
 Screen Shot 2014-03-05 at 7.50.13 PM.jpg (33.9 KB, 81 views) Screen Shot 2014-03-05 at 7.50.13 PM.jpg (33.9 KB, 80 views)

 March 5th, 2014, 09:07 PM #2 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 12,902 Thanks: 882 Re: Need help with Decoding Math watch Well, slap my knee, but somehow -[-pi] = 4 Only way I can see this is [] means floor function floor(-pi) = -4 -(-4) = 4 I rest my case... Watch Repair Shop slogan: "If your watch don't tick, tock to us"
 March 5th, 2014, 10:50 PM #3 Newbie   Joined: Mar 2014 Posts: 2 Thanks: 0 Re: Need help with Decoding Math watch Denis, Thank you. FMT.
 March 6th, 2014, 05:30 AM #4 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 Re: Need help with Decoding Math watch Indeed. When you have mathematical typesetting it should be written $-\lfloor-\pi\rfloor$ but when you just have ASCII -[-pi] is fine. By now I think everyone has realized that $f(x)=-\lfloor-x\rfloor$ gives $\lceil x\rceil$ for positive x.

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