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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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  1. http://users.ox.ac.uk/~ball0888 /lectures /logic

  2. Fantasy Logic League A weekly competition… …in the art of deduction

  3. Previously on THG…

  4. 22 November, 1963 Nightmare on Elm Street

  5. 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.

  6. The scientific study of: English Grammar

  7. MissAnnWiddecombe

  8. Spinster of this parish…

  9. …and, indeed, of all the other parishes as well

  10. A woman of many parts…

  11. ….clumsily assembled

  12. Truly, the face that ate a thousand chips.

  13. Miss Anne Widdecombe at the Conservative Party Conference

  14. 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

  15. Madness! • Ignorance! • Stupidity! • Snobbery!

  16. Ambiguity

  17. We must have the worst JCR food in Oxford

  18. That dart might have landed in baby’s eye

  19. Sentencevs.Message

  20. Truth is not a property of Sentences

  21. Truth is a property of Messages

  22. MessagedeterminesSentence

  23. If Oswald didn’t shoot Kennedy, then somebody else did

  24. April, 1985 A train from Paddington to Bodmin…

  25. The Adventure of….

  26. 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.

  27. The Mystery of…. Modus Ponens

  28. Modus Ponens • P • If P, then Q • So: Q

  29. Oswald didn’t shoot Kennedy… • And if Oswald didn’t shoot Kennedy… • …then somebody else did. • So: Somebody else did.

  30. April, 1985 Oxford

  31. The Reverend Charles Lutwidge Dodgson

  32. Lewis Carroll

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