A Condition Equivalent to Ferromagnetism for a Generalized Ising Model
نویسنده
چکیده
JBSTRACT In the real algebra R(G) over a certain finite group, the operator exp is defined. A condition is stated on exp J which is necessary and sufficient for J in R(G) to be nonnegative (where J is viewed as a function G + R). Physically, this amounts to a condition on the correlations of a generalized system of Ising spins which is necessary and sufficient for the ferromagnetism of the system.
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ورودعنوان ژورنال:
- J. Comb. Theory, Ser. A
دوره 12 شماره
صفحات -
تاریخ انتشار 1972