PROOF.AP.app_cong_r: def of bend-osdev-array@0.1.0.1
Import: import bend-osdev-array@0.1.0.1/PROOF.bend as PROOF
Lines 1002-1004 of bend-osdev-array@0.1.0.1/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-array@0.1.0.1/PROOF.bend&start_line=1002&end_line=1004

import Base

def AP.app_cong_r(-T: Data, -xs: List<&2, T>, -x: List<&2, T>, -y: List<&2, T>, e: {x == y : List<&2, T>}) -> {List.append(&2, T, xs, x) == List.append(&2, T, xs, y) : List<&2, T>}:
  %e : {List.append(&2, T, xs, x) == List.append(&2, T, xs, _) : List<&2, T>}
  {==}

Uses (2):
  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