R-parity breaking and the grand unification program
  We present the study of the possibility to have R-parity breaking interactions in minimal SU(5). An interesting scenario emerges in which the R-parity breaking coupling $\lambda'_{333}$ is large, and its size is related to the value of the tau neutrino mass, assuming that supersymmetry is broken according to low energy supergravity framework. This scenario may also have implications on the issue of $b-\tau$ unification. 
Francesco Vissani