Question: For each numbered statement that is not a premise in each of the formal proofs that follow, state the rule of inference that justifies it.

For each numbered statement that is not a premise in each of the formal proofs that follow, state the rule of inference that justifies it.


1. (D ⋅ E) ⊃ F
2. (D ⊃ F) ⊃ G
∴ E ⊃ G
3. (E ⋅ D) ⊃ F
4. E ⊃ (D ⊃ F)
5. E ⊃ G

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