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## Homework Statement

hamiltonian is given by H=-[tex]\sum [/tex] J

_{ij}s

_{i}s

_{j}

so interaction constants are J

_{ij}=E

_{i}E

_{j}and Ei=+1,-1

s

_{i}=+1,-1 randomly , they are spin variables.

the question is :

show that this system is equivalent to a ferromagnet, by redefining the spin variables.

## The Attempt at a Solution

first of all i am not sure but J

_{ij}should be less than zero. If i know the definiton of ferromagnetic system , i can change the spin variables into an appropriate form. but far now i couldn't find anyhing

So any tip or lead would be nice to start with.

thanks

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