279
279
T-≡ {false} = equivalence (λ ()) (λ ())
280
280
T-≡ {true} = equivalence (const refl) (const _)
282
286
T-∧ : ∀ {b₁ b₂} → T (b₁ ∧ b₂) ⇔ (T b₁ × T b₂)
283
287
T-∧ {true} {true} = equivalence (const (_ , _)) (const _)
284
288
T-∧ {true} {false} = equivalence (λ ()) proj₂