ProofNat.pow_sub1.go: def of lawful-words@0.1.0.0
Import: import lawful-words@0.1.0.0/proof_nat.bend as ProofNat
Lines 1414-1416 of lawful-words@0.1.0.0/proof_nat.bend: https://jend.leeeet.dev/read.txt?path=lawful-words@0.1.0.0/proof_nat.bend&start_line=1414&end_line=1416

import Base

def pow_sub1.go(+u: Nat) -> {Nat.sub(Nat.double(1n+u), 1n) == 1n+Nat.double(Nat.sub(1n+u, 1n)) : Nat}:
  %Equal.sym(Nat, Nat.sub(u, 0n), u, sub_zero(u)) : {Nat.sub(Nat.double(1n+u), 1n) == 1n+Nat.double(_) : Nat}
  {==}

Uses (5):
  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.double
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub
  https://jend.leeeet.dev/definition.txt?path=lawful-words@0.1.0.0/proof_nat.bend&name=sub_zero