Created
January 2, 2020 10:10
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| data ExactlyOne {A : Set} : (xs : List A) → Set where | |
| TheOne : ∀ {x} → ExactlyOne (x ∷ []) | |
| exactlyOne : ∀ {a} → (xs : List a) → Dec (ExactlyOne xs) | |
| exactlyOne [] = no (λ ()) | |
| exactlyOne (x ∷ []) = yes TheOne | |
| exactlyOne (x ∷ y ∷ xs) = no λ () |
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