>
> A third option is to define the empty interval as a point on the
> timeline at 09:00 that is therefore contained in c:
> - a, b and c all abut each other at 09:00
> - c contains b, thus b and c overlap
>
i think this option is equivalent to saying that all zero-length
intervals are effectively closed. although if you call such an interval
a point, you can avoid introducing the notion of closed intervals. this
seems to be the way to go if you don't want to introduce closed
intervals before 1.3.
al
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