PROOF.sub0: def of bendtorch@1.3.0.0
Import: import bendtorch@1.3.0.0/PROOF.bend as PROOF
Lines 185-191 of bendtorch@1.3.0.0/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bendtorch@1.3.0.0/PROOF.bend&start_line=185&end_line=191

import Base

# n - 0 is n
def sub0(+n: Nat) -> {Nat.sub(n, 0n) == n : Nat}:
  match n:
    case 0n:
      {==}
    case 1n+p:
      {==}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub