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Re: [ontolog-forum] Time representation

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From: Pat Hayes <phayes@xxxxxxx>
Date: Tue, 22 Jan 2008 17:29:41 -0600
Message-id: <p06230917c3bc0be2a91c@[]>
At 1:20 PM -0700 1/22/08, Sharma, Ravi wrote:    (01)

>We will discuss the concept of wheel of time vs arrow of time "sometime"
>later.    (02)

FWIW, there has been some interesting work on interval algebras for 
circular time. Turns out that there are 16 (rather than 13) possible 
interval relations on a circle, and they have a very elegant group 
structure. Moreover, the standard 'time line' is simply the circle 
with one point missing (the point at infinity), which rules out 4 of 
the relations and splits one of the remaining 12 into two cases: 
hence the peculiar number (13) of interval relations on a line. It 
also of course ruins the lovely symmetry of the circle.    (03)

Pat    (04)

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