= Thermal exponent from a discrete renormalization map
{title2=$\nu=\log b/\log\lambda_t$}
A discrete <renormalization group> with length factor $b>1$ and positive relevant thermal multiplier $\lambda_t>1$ sends $t$ to $\lambda_t t$ and the <correlation length> to $\xi/b$. Combining this with $\xi\sim|t|^{-\nu}$ gives the displayed <correlation-length critical exponent>. The corresponding <scaling dimension> is $y_t=\log\lambda_t/\log b=1/\nu$. Relevance of discrete multipliers is determined by magnitude relative to one, unlike the sign criterion for continuous-flow <eigenvalues>.
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