# SeeSaw mechanism

Hi all,

I think it's just an Eigenvalue preoblem. I'm studying Seesaw mechanism from
http://www.quantumfieldtheory.info/TheSeesawMechanism

I don't get how he substituted in equ. 21 for N Eigenvalue from equ. 20, that ## \frac{m_D}{m^R} ## is a factor of ## \nu_R ## not ## \nu_l^c ## ? Any help ..

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why do you say that it's a factor of $\nu_R$ ? he puts it as a factor of $\nu_L$.