Found note: “List of Counterexamples”

I found this note when I was cleaning out some old papers. It’s like finding a strange little gift from the us of the past.

List of Counterexamples

  1. Communism
  2. Hitler
  3. Klein 4 group
  4. Petersen graph
  5. Plasma
  6. Hawaii
  7. Neutrinos
  8. Tacoma Narrows bridge
  9. Rwanda
  10. The 1%
  11. Duck-billed platypus
  12. Seahorses

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