In my [is, is not] definitional pair the "is not" component is the All minus the "is" component.

Thus the "is not" member is not simply unwinged horses or the like. In most of these pairs I suspect the "is not" component has no apparent usefulness [to most SAS [if they exist]]. Be that as it may both members of the [All, Nothing] pair seem to have usefulness.

Hal






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