# Homework Help: Spin glass for ferromagnetic systems

1. Dec 20, 2009

### PullMeOut

1. The problem statement, all variables and given/known data
hamiltonian is given by H=-$$\sum$$ 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.
3. 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
thanks

Last edited: Dec 20, 2009