Natfuel.gz: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/proofs/math/typed/natfuel.bend as Natfuel
Lines 49-55 of bend-collections-laws-math@1.0.0.0/proofs/math/typed/natfuel.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/proofs/math/typed/natfuel.bend&start_line=49&end_line=55

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

# two fuels that both reach the end give the same gcd
def gz(+f: Nat, +a: Nat) -> {M.gcd_go(f, a, 0n) == a : Nat}:
  match f:
    case 0n:
      {==}
    case 1n+g:
      {==}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/natural.bend&name=gcd_go