Cardy’s result for the correlation function of a periodic, L×∞ strip at bulk criticality is rederived by invoking a conformal mapping of the strip onto itself. No prior knowledge of the bulk correlations is needed: in fact, Cardy’s original logarithmic mapping implies the power-law behavior $R^{\mathrm{-}\eta }$ of the bulk correlation function.

• Received 31 July 1985

DOI:https://doi.org/10.1103/PhysRevB.32.6089