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On 10/21/2012 02:17 PM, Ralph Baker Kearfott wrote:
Does anyone have a strong opinion on whether mid(Empty) = NaN or mid(Empty) = -\infty? or something else?
mid(Empty) = -\infty is meaningless, mid(Empty) = NaN the only sensible choice.
rad(Empty)= -\infty and rad(Empty)=NaN are both defendable on different grounds (and same for width).
On 10/21/2012 03:30 AM, John Pryce wrote:IMHO the only sensible value for mid(Empty) is NaN. Any real value falsifies the Level 2 invariant mid(xx) \in xx, which holds in all other cases. For rad(Empty), I'm easy between -oo and NaN with a small preference for -oo, on the grounds that I also slightly prefer wid(Empty) to be -oo.
Arnold Neumaier