% SZS status Theorem for plus__ass
% SZS output start Proof for plus__ass
  file('i/f/semi_ring/plus__assoc',ch4s_semiu_u_rings_plusu_u_assoc)).
  file('i/f/semi_ring/plus__assoc',ah4s_semiu_u_rings_isu_u_semiu_u_ringu_u_def)).
% SZS output end Proof for plus__ass
