Self-organizing chemical patterns — Turing instability
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Gray-Scott model: Two chemicals U and V react: U + 2V → 3V (autocatalysis), V → P (decay).
Feed rate F replenishes U; kill rate k removes V.
Diffusion spreads chemicals — Turing (1952) showed this breaks homogeneity spontaneously.
Different F/k values yield spots, stripes, worms, mazes, or chaos — each a stable attractor of the PDE.
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