• Even mathematics is capable of error, because mathematics is a creative act.
  • Knowledge is conjectural. It's always being guessed.
  • The axioms might be incorrect. How do we know that an axiom is incorrect? Traditionally, the answer has been because it's clearly and obviously the case.
  • How can you prove that x plus zero must equal x? Well, you just have to accept that it's true. But if we consider something like euclid's elements, for example, draw two points on a piece of paper. Now, through those points, a unique straight line can be drawn. This was accepted as true for centuries, but was later shown to be false.
  • By questioning these deepest assumptions, it leads to true progress in the sciences.

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