% SZS status Theorem for plus__zero__le
% SZS output start Proof for plus__zero__le
  file('i/f/ring/plus__zero__left',ah4s_rings_isu_u_ringu_u_def)).
  file('i/f/ring/plus__zero__left',ch4s_rings_plusu_u_zerou_u_left)).
% SZS output end Proof for plus__zero__le
