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http://users.ox.ac.uk/~ball0888. /lectures /logic. Fantasy Logic League. A weekly competition… …in the art of deduction. Previously on THG…. 22 November, 1963. Nightmare on Elm Street. Oswald Sentences. [A] If Oswald didn’t shoot Kennedy, then somebody else did.
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http://users.ox.ac.uk/~ball0888 /lectures /logic
Fantasy Logic League A weekly competition… …in the art of deduction
22 November, 1963 Nightmare on Elm Street
Oswald Sentences • [A] If Oswald didn’t shoot Kennedy, then somebody else did. • [B] If Oswald doesn’t shoot Kennedy, then somebody else will. • [C] If Oswald hadn’t shot Kennedy, then somebody else would have.
The scientific study of: English Grammar
A Counterblast • English has NO infinitive • English has NO moods – neither indicative nor subjunctive nor any other • English has but TWO tenses – present and past
Madness! • Ignorance! • Stupidity! • Snobbery!
April, 1985 A train from Paddington to Bodmin…
The curious incident of the dog in the night-time • “Is there any point to which you would wish to draw my attention?” • “To the curious incident of the dog in the night-time” • “The dog did nothing in the night-time.” • “That was the curious incident,” remarked Sherlock Holmes.
The Mystery of…. Modus Ponens
Modus Ponens • P • If P, then Q • So: Q
Oswald didn’t shoot Kennedy… • And if Oswald didn’t shoot Kennedy… • …then somebody else did. • So: Somebody else did.
April, 1985 Oxford