Renormalization-group recursion relations are used to calculate to first order in $\epsilon =4-d$ the two-point correlation function near a critical point above $T_c$ and in zero field. This approach gives results which are valid for all values of the ratio of wave number to inverse correlation length.

• Received 18 December 1975

DOI:https://doi.org/10.1103/PhysRevB.14.1123