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Mind 2000 109(436):781-823; doi:10.1093/mind/109.436.781
© 2000 by Mind Association
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'Yes and no'

I Rumfitt

University College, Oxford, OX1 4BJ, UK

In what does the sense of a sentential connective consist? Like many others, I hold that its sense lies in rules that govern deductions. In the present paper, however, I argue that a classical logician should take the relevant deductions to be arguments involving affirmative or negative answers to yes-or-no questions that contain the connective. An intuitionistic logician will differ in concentrating exclusively upon affirmative answers. I conclude by arguing that a well known intuitionistic criticism of classical logic fails if the answer 'No' is accorded parity with the answer 'Yes'.


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