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Vladik Kreinovich wrote: > The explanation is simple: in Kaucher arithmetic, the interval ?5,2Ù > DOES NOT mean {x: 5<= x <=2}, this interpretation would lead to an > empty set. That's not how Dan interpreted it; he wrote: >> Can it really be that the sum of {x | 5 <= x or x <= 2} ... Note the OR, not AND. He interprets it as the union of two disjoint intervals [-oo,2] U [5,+oo]. Michel. Sent: 2009-03-16 20:04:41 UTC