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- ex3 : ∀ a b → a ≡ b → 1 + a ² ≡ b ² + 1
- ex3 a b p = p
- ⇒ a ≡ b ⟨ (λ x → 1 + x ²) ⟩
- ⇒ 1 + a ² ≡ 1 + b ² ⟨⟩⟨ +-comm 1 (b ²) ⟩
- ⇒ 1 + a ² ≡ b ² + 1 ∎
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