In addition, there
are impossible propositions, but maybe not impossible events and certainly
not impossible possible events.
Are impossible propositions the same as logical contradictions, or something
else?
I would have said that there are impossible events rather than impossible
propositions. For example, being in two places at once would be an
impossible
event, but not a logical contradiction:
lo'e nu mi zvati la paris ecabo la romas cu na cumki
Also, I agree that (barring fuzziness) an event can't be both possible and
impossible,
but I have no problem with {lo'e nu ko'a cumki cu na cumki} or with
{lo'e nu ko'a na cumki cu cumki}, they just involve different levels of
abstraction,
and that's how I would tend to interpret "impossible possible event" and
"possible
impossible event".