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Partition function zeros
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The Lee-Yang circle theorem: phase transitions from the complex-fugacity structure of Z.


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    <div class="sphx-glr-thumbcontainer" tooltip="A finite system&#x27;s partition function is a finite sum of manifestly analytic terms -- so where can a genuine phase transition, a true discontinuity in the free energy, possibly come from? Lee and Yang&#x27;s 1952 answer: continue the partition function into the complex fugacity plane and look at its zeros. Writing the Ising Hamiltonian with a field,">

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