SOLUTION: Please help! A ⊃ B A ⊃ (B ⊃ C) B ⊃ (C ⊃ D) ∴ A ⊃ D

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Question 1099349: Please help!
A ⊃ B
A ⊃ (B ⊃ C)
B ⊃ (C ⊃ D)
∴ A ⊃ D
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
 1.  A ⊃ B
 2.  A ⊃ (B ⊃ C)
 3.  B ⊃ (C ⊃ D)      /∴ A ⊃ D

                   |4.  A          ACP
                   |5.  B        1,4, MP
                   |6.  B ⊃ C    2,4, MP
                   |7.  C        6,5, MP
                   |8.  C ⊃ D    3,5, MP
                   |9.  D        8,7, MP
10. A ⊃ D                        4-9 CP

Edwin