= Real-space renormalization group
A real-space <renormalization group> replaces groups of microscopic degrees of freedom by retained coarse variables, summing over the eliminated variables to define a coarse <Hamiltonian>. The effective Boltzmann weights must preserve the <partition function> up to a tracked normalization. <Spin decimation> retains selected spins rather than forming an average block variable. Coarse-graining generally generates additional interactions, so closure of a chosen finite coupling family requires justification.
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