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Trouble understanding the below proofs: Any assistance would be appreciated! Thanks, Eric. Prove the following sequents. a. (A B) C A (B C) b. P

Trouble understanding the below proofs:

Any assistance would be appreciated!

Thanks, Eric. image text in transcribed

Prove the following sequents. a. (A B) C A (B C) b. P Q rightarrow (P Q) c. (P rightarrow Q) (Q rightarrow R) P Q rightarrow R d. P rightarrow (Q R) (P rightarrow Q) (P rightarrow R) e. X rightarrow Y, A rightarrow B X A rightarrow Y B

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