Wide.is_zero: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/proofs/lib/lemmas/src/wide.bend as Wide
Lines 30-37 of bend-collections-laws-math@1.0.0.0/proofs/lib/lemmas/src/wide.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/proofs/lib/lemmas/src/wide.bend&start_line=30&end_line=37

import Base

def is_zero(n: Nat, w: Word(n)) -> Bool:
  match n:
    case 0n:
      True{}
    case 1n+p:
      match w:
        case WCon{b, tail}:
          Bool.not(b) && is_zero(p, tail)

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.not
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Word
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Word.Con