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Re: A question Level 1 <---> level 2 mappings; arithmetic versus applications

Dan Zuras wrote:
>  Level 1 is the set of all possible contiguous subsets
>  of the extended Reals.

Based on motions 2 and 3, Level 1 only contains plain Reals, and no
infinities.  It does contain unbounded intervals because those are
still "contiguous subsets of the Reals".

Infinities are used at Level 2 to encode unboundedness.

Michel.
---Sent: 2010-06-30 21:46:49 UTC