def internal_ins_pick

bend-mathlib@0.8.1.0 · perm.bend:83

import Base
import bendlib-kernel-list@1.0.0.0/list.bend as K

83def internal_ins_pick(-A: Data, b: Bool, +x: A, +y: A, +t: List<&2, A>, -r: List<&2, A>, ih: K.perm(A, x <> t, r)) -> K.perm(A, x <> y <> t, Bool.pick(List<&2, A>, b, x <> y <> t, y <> r)):
84  match b:
85    case True{}:
86      perm_refl(A, x <> y <> t)
87    case False{}:
88      perm_trans(A, x <> y <> t, y <> x <> t, y <> r, perm_swap(A, x, y, t), perm_cons(A, y, x <> t, r, ih))