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i have a problem in styding the critical bihaviour of the tow dimensional ising model

when i use periodiques boundary conditions i found that the fixed point for this case is the PRG equation that mean the following recursion relation: (N-1) [E1(t,N-1)-Eo(t,N-1)]=N[E1(t,N)-Eo(t,N)] where E1 and E0 are first and ground state enrgie and N is the numbre of spins in the lattice

but how it would be the phenomenological renormalization group equation for the ising model if we impose the fixed or mixed boundary boundary condition "plus_plus" or "plus_free" boundary condition

thank you

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# Searching the phenomenological renormalization group equation for 2d ising model

Can you offer guidance or do you also need help?

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