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A or ( A implies B ) − Fitch-style proof

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Dec 15th, 2017
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  1. If not ( A or ( A implies B ) ):
  2. If A:
  3. If not B:
  4. A or ( A implies B ).
  5. not not B.
  6. B.
  7. A implies B.
  8. A or ( A implies B ).
  9. not not ( A or ( A implies B ) ).
  10. A or ( A implies B ).
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