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Oct 23rd, 2018
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  1. ∧I
  2. - A
  3. - B
  4. - ⊦ A ∧ B
  5.  
  6. ∧E
  7. - A ∧ B
  8. - ⊦ A
  9.  
  10. ∨I
  11. - A
  12. - ⊦ A ∨ B
  13.  
  14. ∨E
  15. - A → C
  16. - B → C
  17. - A ∨ B
  18. - ⊦ C
  19.  
  20. →I
  21. - if (premises, A ⊦ B)
  22. - then (premises ⊦ A → B)
  23.  
  24. →E
  25. - A
  26. - A → B
  27. - ⊦ B
  28.  
  29. ¬I
  30. - A → B
  31. - A → ¬B
  32. - ⊦ ¬A
  33.  
  34. ¬E
  35. - ¬A → B
  36. - ¬A → ¬B
  37. - ⊦ A
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