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Why Is This 15-Puzzle Impossible? - Numberphile

Why Is This 15-Puzzle Impossible? - Numberphile

Numberphile via YouTube Direct link

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Why Is This 15-Puzzle Impossible? - Numberphile

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  1. 1 Introduction
  2. 2 The Mystery
  3. 3 Sam Lloyd
  4. 4 The Challenge
  5. 5 The Paper
  6. 6 Permutations
  7. 7 Possible
  8. 8 Sliding
  9. 9 Invariants
  10. 10 The blank space
  11. 11 The number of moves
  12. 12 Even number of moves
  13. 13 How to get 15
  14. 14 Can you
  15. 15 Odd
  16. 16 Good News
  17. 17 Prediction

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