Left-Right Symmetric Model from Geometrical Formulation of Gauge Theory   in $M_4 \times Z_2 \times Z_2$
  The left-right symmetric model (LRSM) with gauge group $SU(2)_{L} \times SU(2)_{R} \times U(1)_{B-L}$ is reconstructed from the geometric formulation of gauge theory in $M_4 \times Z_2 \times Z_2$ where $M_4$ is the four-dimensional Minkowski space and $Z_2 \times Z_2$ the discrete space with four points. The geometrical structure of this model becomes clearer compared with other works based on noncommutative geometry. As a result, the Yukawa coupling terms and the Higgs potential are derived in more restricted forms than in the standard LRSM. 
G. Konisi and T. Saito (Kwansei Gakuin Univ.) and Z. Maki and M.   Nakahara (Kinki Univ.)