= Repulsive renormalization-group trajectory
A repulsive renormalization-group trajectory leaves a <renormalization-group fixed point> along its unstable manifold as the coarse-graining length increases. Its tangent directions are <relevant operators>. The <critical surface> is instead the stable manifold, whose irrelevant coordinates approach the critical fixed point after relevant fields are tuned. For a discrete step, relevance is determined by multipliers larger than one in magnitude, not merely by their being positive.
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