Here Is A Hand - Logical Form

Logical Form

The skeptical argument takes the form of modus ponens:

  • If A then B.
  • A.
  • Therefore B.

Moore's argument flips the modus ponens structure into a modus tollens:

  • If A then B.
  • Not B.
  • Therefore not A.

This illustrates Fred Dretske's aphorism that "ne man's modus ponens is another man's modus tollens"

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