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Alternatives/Counterfactual/Lewis: E.g. Assuming I would do something else today, then tomorrow would be a little different - but I cannot say anything about it in a clear sense.
Counterfactual possibility/Possible worlds/Lewis: E.g. quasi-miracle (highly unlikely, but no violation of laws of nature) - ambiguity: Rear part: be a) could have been (CHB): all most similar worlds are those where it is possible. - b) would not (NWN) - some of the most similar worlds are those where it happens - then: 1) If Nixon had pressed the button, no QW would have happenend - and 2) "... there would have been a slim chance" they are true together - but 1 conflicts with NWN and 2 implies CHB.
The winner could have lost (true).
But: It could have been that the winner loses ((s) wrong)._____________Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution.
Clarence Irving Lewis
Collected Papers of Clarence Irving Lewis Stanford 1970
Die Identität von Körper und Geist Frankfurt 1989
Konventionen Berlin 1975
Philosophical Papers Bd I New York Oxford 1983
Philosophical Papers Bd II New York Oxford 1986
Clarence Ivar Lewis
Mind and the World Order: Outline of a Theory of Knowledge (Dover Books on Western Philosophy) 1991