theorem
  LSeg(p,G*(1,1)-|[1,1]|) meets Int cell(G,0,0)
proof
  now
    take a = G*(1,1)-|[1,1]|;
    thus a in LSeg(p,G*(1,1)-|[1,1]|) by RLTOPSP1:68;
    thus a in Int cell(G,0,0) by Th36;
  end;
  hence thesis by XBOOLE_0:3;
end;
