theorem Th35:
  cell(l,r) in cells(0,G) iff l = r & for i holds l.i in G.i
proof
  hereby
    assume cell(l,r) in cells(0,G);
    then consider x such that
A1: cell(l,r) = cell(x,x) and
A2: for i holds x.i in G.i by Th34;
A3: for i holds x.i <= x.i;
    then l = x by A1,Th28;
    hence l = r & for i holds l.i in G.i by A1,A2,A3,Th28;
  end;
  thus thesis by Th34;
end;
