Natural.Perm.self: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/math/natural.bend as Natural
Lines 188-189 of bend-collections-laws-crypto@1.0.0.0/spec/math/natural.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/math/natural.bend&start_line=188&end_line=189

import Base
import bend-collections-laws-crypto@1.0.0.0/src/math/natural.bend as M

def Perm.self(+n: Nat) -> Type:
  {M.perm(n, n) == factorial(n) : Nat}

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/math/natural.bend&name=factorial
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/natural.bend&name=perm