what is Lee-Yang circle theorem and what is it used for ?? , i mean given a measure how can you know that is Ferromagnetic and hence all its zeros lie on a Circle ??

the Lee-Yang circle theorem proof is it only valid for the measure $ \delta (x-1) + \delta (x+1) $

how can you proof the Circle theorem for any measure ?? if any measure is positive and EVEN does Lee-Yang circle theorem hold ??

This post imported from StackExchange Physics at 2014-07-18 05:00 (UCT), posted by SE-user Jose Javier Garcia