reserve p, q for Point of TOP-REAL 2,
  r for Real,
  h for non constant standard special_circular_sequence,
  g for FinSequence of TOP-REAL 2,
  f for non empty FinSequence of TOP-REAL 2,
  I, i1, i, j, k for Nat;

theorem
  1 <= i_n_e h & i_n_e h <= width GoB h & 1 <= i_s_e h & i_s_e h <=
width GoB h & 1 <= i_n_w h & i_n_w h <= width GoB h & 1 <= i_s_w h & i_s_w h <=
  width GoB h
proof
A1: [len GoB h, i_s_e h] in Indices GoB h by Def3;
A2: [1, i_n_w h] in Indices GoB h by Def2;
A3: [1, i_s_w h] in Indices GoB h by Def1;
  [len GoB h, i_n_e h] in Indices GoB h by Def4;
  hence thesis by A1,A2,A3,MATRIX_0:32;
end;
