Desperate youth

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Let us take the example given by David Lewis in his book ‘Counterfactuals’. If a kangaroo did not have a tail it would fall over. The material conditional is not required to hold for worlds sufficiently far from W(Φ), i.e. worlds in which the kangaroo has crutches.

Michael Redhead, Incompleteness, Nonlocality, and Realism: A Prolegomenon to the Philosophy of Quantum Mechanics, anche se sembra un passaggio della Guida galattica.

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