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| ==Peierls' argument== | | ==Peierls' argument== |
| Before the explicit solution by [[Lars Onsager]], Peierls put forward an ingenuous argument showing that
| | The argument considers the entropy associated with the interface between domains with different orientations. |
| the [[ Ising_Models#2-dimensional_Ising_model | two-dimensional Ising model]] must have a phase transition (at a finite temperature). The argument considers the [[entropy]] associated with the interface between domains with different orientations (Ref. 1).
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| ==References==
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| *Rudolf Peierls "More surprises in Theoretical Physics". Princeton University Press (1991) ISBN 0-691-02522-3
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