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From: Carl Daniel (cpdaniel_at_[hidden])
Date: 2002-09-01 20:05:05

I'm just starting to review the library, but one idea which popped into my
head, based on something I did years ago, is that of including some extended
logical operations to compliment interval comparisons.

If one orders the internal comparision results as
{false,indeterminate,true}, then there is a sensible definition for all of
the common logic operations (assume false -> true correspond to values 0, 1,

a AND B = min(a,b)
a OR b = max(a,b)
NOT a = 2-a

XOR can be implemented via table, or by it's basic definition:

a XOR b = (a AND NOT b) OR (b AND NOT a)

Would that be a useful addition to the library? I suppose it would require
that the relational operators return a UDT to allow overloading (perhaps
they do already? I haven't even looked yet).


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