% SZS status Theorem for mult__s
% SZS output start Proof for mult__s
  file('i/f/semi_ring/mult__sym',ah4s_semiu_u_rings_isu_u_semiu_u_ringu_u_def)).
  file('i/f/semi_ring/mult__sym',ch4s_semiu_u_rings_multu_u_sym)).
% SZS output end Proof for mult__s
