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We investigate the physical meaning of some of the texture zeros which appearin most of the Ansatze on leptonic masses and their mixing. It is shown thatstarting from arbitrary lepton mass matrices and making suitable weak basistransformations one can obtain some of these sets of zeros, which thereforehave no physical content. We then analyse four-zero texture Ansatze where thecharged lepton and neutrino mass matrices have the same structure. The fourtexture zeros cannot be obtained simultaneously through weak basistransformations, so these Ansatze do have physical content. We show that theycan be separated into four classes and study the physical implications of eachclass.

Weak Basis Transformations and Texture Zeros in the Leptonic Sector