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Oct 23rd, 2018
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  1. ∧I
  2. - A
  3. - B
  4. - ⊦ A ∧ B
  5. ∧E
  6. - A ∧ B
  7. - ⊦ A (or B)
  8. ∨I
  9. - A
  10. - ⊦ A ∨ B (or B ∨ A)
  11. ∨E
  12. - A → C
  13. - B → C
  14. - A ∨ B
  15. - ⊦ C
  16. →I
  17. - if (premises, A ⊦ B)
  18. - then (premises ⊦ A → B)
  19. →E
  20. - A
  21. - A → B
  22. - ⊦ B
  23. ¬I
  24. - A → B
  25. - A → ¬B
  26. - ⊦ ¬A
  27. ¬E
  28. - ¬A → B
  29. - ¬A → ¬B
  30. - ⊦ A
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