Question
(1) Give formal proofs of the following sequents, for any theory T and formulas φ, ψ,...
(1) Give formal proofs of the following sequents, for any theory T and formulas φ, ψ, θ. (a) T ∪ {ψ} |− φ → ψ
(b) |− φ ∧ T ↔ φ
(c) |− φ ∧ (ψ ∨ θ) ↔ (φ ∧ ψ) ∨ (φ ∧ θ)
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