Abstract
Abstract
This chapter concerns the indexical barrier to entailment. It introduces some of the history of the barrier through the work of Casteñeda, Perry, and Lewis, and provides basic background on context-sensitivity and indexicals and the under-appreciated consequences for logic. Then a simplified version of Kaplan’s Logic of Demonstratives is introduced, which turns out to permit a potential counterexample analogous to ought implies can in the normative case. The chapter argues that in the indexical case the correct solution is much more obvious, setting things up for the solution to the normative tetralemma in the next chapter.
Publisher
Oxford University PressOxford
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