Involution.length_append: law of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/proofs/crypto/chacha/involution.bend as Involution
Lines 46-49 of bend-collections-laws-crypto@1.0.0.0/proofs/crypto/chacha/involution.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/proofs/crypto/chacha/involution.bend&start_line=46&end_line=49

import Base

law length_append:
  for +xs: List<&2, U32>
  for +ys: List<&2, U32>
  {List.length(&2, U32, List.append(&2, U32, xs, ys)) == Nat.add(List.length(&2, U32, xs), List.length(&2, U32, ys)) : Nat}

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.cong
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.length
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32