In philosophical logic, the concept of an impossible world (sometimes non-normal world) is used to model certain phenomena that cannot be adequately handled using ordinary possible worlds. An impossible world, w, is the same sort of thing as a possible world (whatever that may be), except that it is in some sense "impossible." Depending on the context, this may mean that some contradictions are true at w, that the normal laws of logic or of metaphysics fail to hold at w, or both.
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Famous quotes containing the words impossible and/or world:
“If you don’t begin to be a revolutionist at the age of twenty, then at fifty you will be a most impossible old fossil. If you are a red revolutionary at the age of twenty, you have some chance of being up-to-date when you are forty!”
—George Bernard Shaw (1856–1950)
“If all things were eternall,
And nothing their end bringing;
If this should be, then how should we
Here make an end of singing?”
—Unknown. If All the World Were Paper (l. 21–24)