Is bi-maximal mixing compatible with the large angle MSW solution of the   solar neutrino problem?
  It is shown that the large angle MSW solution of the solar neutrino problem with a bi-maximal neutrino mixing matrix implies an energy-independent suppression of the solar nu_e flux. The present solar neutrino data exclude this solution of the solar neutrino problem at 99.6% CL. 
C. Giunti