Spin glass for ferromagnetic systems

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Homework Statement


hamiltonian is given by H=-[tex]\sum [/tex] Jij si sj
so interaction constants are Jij=EiEj and Ei=+1,-1
si=+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 Jij 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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