Verify, without using a truth table, if Γ ⊨ φ holds or not: a) = { → (¬ → ( ∨ ))); ¬ } ( ∧ ¬) → b) = {¬ → ( ∨ ); ¬ ∨ ; ¬ ∨ ¬} c) = {( ∧ ) → ; ¬ → ¬; ( ∨ ) ∧ } ⊥ d) = (The empty set) (( ∨ ( → )) → ) →

Verify, without using a truth table, if Γ ⊨ φ holds or not:

a) = { → (¬ → ( ∨ ))); ¬ } ( ∧ ¬) →
b) = {¬ → ( ∨ ); ¬ ∨ ; ¬ ∨ ¬}
c) = {( ∧ ) → ; ¬ → ¬; ( ∨ ) ∧ } ⊥
d) = (The empty set) (( ∨ ( → )) → ) →

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