Abstract
Chapter 4 examines David Lewis’s contextualist solution to the grandfather paradox. Section 1 introduces the basic elements of Lewis’s view and explains how they are supposed to help solve the various paradoxes of freedom. Section 2 examines a famous objection to Lewis’s view that is put forward by Kadri Vihvelin. Section 3 addresses a very different kind of worry, due to Paul Horwich. (According to Horwich, grandfather-style paradoxes do not show that time travel is impossible, but they do give us reason to think it is unlikely.) Section 4 then concludes by surveying various “mechanical” paradoxes in which self-defeating acts seem to arise without any operation of free will.
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