definition 2.14.1
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theorem2∙13∙1 m n = encode m n , qinv-to-isequiv (mkQinv (decode m n) (backward m n) (forward m n))
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theorem2∙13∙1 m n = encode m n , qinv-to-isequiv (mkQinv (decode m n) (backward m n) (forward m n))
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```
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```
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## 2.14 Example: equality of structures
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### Definition 2.14.1
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```
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SemigroupStr : (A : Set l) → Set l
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SemigroupStr A = Σ (A → A → A) (λ m → (x y z : A) → m x (m y z) ≡ m (m x y) z)
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Semigroup : Set (lsuc l)
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Semigroup {l = l} = Σ (Set l) SemigroupStr
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```
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## 2.15 Universal properties
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## 2.15 Universal properties
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Definition 2.15.1
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Definition 2.15.1
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