def Shuffle.permutation

bend-collections-laws-crypto@1.0.0.0 · spec/math/random.bend:113

import Base
import bend-collections-laws-crypto@1.0.0.0/src/math/u64.bend as W
import bend-collections-laws-crypto@1.0.0.0/src/math/random/rand.bend as R
import bend-collections-laws-crypto@1.0.0.0/spec/math/random/rand.bend as SR

113def Shuffle.permutation(~A: Data, ~V: Data, ~rel: A -> V -> Bool, ~S: Data, ~next: S -> W.U64 & S, +s: S, +xs: List<&2, A>, +v: V) -> Type:
114  {SR.occurrences(~A, ~V, ~rel, v, R.fst(List<&2, A>, S, R.shuffle(~A, ~S, ~next, s, xs))) == SR.occurrences(~A, ~V, ~rel, v, xs) : Nat}