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Def possibility/Stalnaker: a way in which the world can be - but just as the concept of truth does not say what is true and that of existence what exists, the term possibility does not say which possibilities there are.
Possibility/criterion/Lewis/Stalnaker: there is no criterion for possibility. - Solution: understand what is possible rather than to decide about it - E.g. whether water could have been something else than H2O - ultimately it is about understanding expressions - not about the status of worlds (poss.wo. or imposs.wo.).
Possibility/Stalnaker: can only be described by way of its possible implementation. -
It is useful to distinguish options from the language in which they are being described. It is not excluded that one thing can be reduced to the other in the end.
Assertion: a main function of assertions is to transmit information by distinguishing between possibilities.
Ways a World may be Oxford New York 2003