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The definition method of the limit for the neutrino mass of rest by using the analysis
of the extreme values of the beta-particles distribution under beta-decay is given.
The anomaly of distribution at the end of the curve was analyzed. The results of the
experiments by spectrum analysis of electrons under tritium disintegration and the
results recording of the stream of neutrinos from the supernova SN-1987A flash to
estimate the limit for the neutrino mass were analyzed and compared. The problems
of interpretation of the results obtained disappear in the case the mass less flavor
of neutrino along with mass neutrino.