Prove the following: a. AA b. (( AB)A)((BA)B) c. ( A B)(AB)
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Prove the following:
a. ⊢ A→A
b. ⊢(( ¬A→¬B)→A)→((¬B→¬A)→¬B)
c. ⊢(¬ ¬ ¬A→¬ ¬ ¬B)→(¬A→¬B)
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