Top.div4: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/argon2/top.bend as Top
Lines 52-55 of bend-collections-laws-crypto@1.0.0.0/proofs/crypto/argon2/top.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/crypto/argon2/top.bend&start_line=52&end_line=55

import Base
import bend-collections-laws-crypto@1.0.0.0/proofs/lib/lemmas/proofs/nat_algebra.bend as NA

# sl = q / 4 = X.
def div4(+x: Nat) -> {Nat.div(Nat.mul(4n, x), 4n) == x : Nat}:
  %Equal.sym(Nat, Nat.mul(4n, x), Nat.mul(x, 4n), NA.mul_comm(4n, x)) : {Nat.div(_, 4n) == x : Nat}
  div_exact(x, 4n, {==})

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.div
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.mul
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/crypto/argon2/top.bend&name=div_exact
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/lib/lemmas/proofs/nat_algebra.bend&name=mul_comm