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The exponent $\\nu$ controls the behavior of a two-point function $<\\phi \\phi>$ {\\it near} the critical point $T\\neq T_c$, but can be evaluated on the critical point $T=T_c$ by the use of the vertex function $\\Gamma^{(2,1)}$. We derive a self-consistent equation for $\\Gamma^{(2,1)}$ within the 2PI effective action, and solve it by iteration in the 1/N expansion. 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