Created
October 10, 2017 00:24
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| module NotElem | |
| import Data.Vect | |
| %default Total | |
| NotElem : (x : a) -> Vect n a -> Type | |
| NotElem x ys = Not (Elem x ys) | |
| notElem : DecEq a => (x : a) -> (ys : Vect n a) -> Dec (NotElem x ys) | |
| notElem x ys with (isElem x ys) | |
| notElem x ys | (Yes prf) = No ((\a, f => f a) prf) | |
| notElem x ys | (No contra) = Yes contra |
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