Convergence Encyclopedia: C11 — Networks / Small-World / Scale-Free
F1 — Tier. T1 (small-world phenomenon); T1 (scale-free claim, with Clauset caution). Uncertainty flag: The scale-free property is less ubiquitous than initially claimed; many networks are better described by alternative distributions.
F2 — Sources.
- Euler, L. (1736). “Solutio problematis ad geometriam situs pertinentis.” Commentarii Academiae Scientiarum Petropolitanae, 8, 128–140.
- Watts, D.J. & Strogatz, S.H. (1998). “Collective dynamics of ‘small-world’ networks.” Nature, 393(6684), 440–442.
- Barabasi, A.L. & Albert, R. (1999). “Emergence of scaling in random networks.” Science, 286(5439), 509–512.
- Granovetter, M.S. (1973). “The strength of weak ties.” American Journal of Sociology, 78(6), 1360–1380.
F3 — Domains. Neural networks (brain connectome), internet routing, food webs, metabolic networks, scientific collaboration networks, social networks, power grids.
F4 — Scale. Protein interaction networks (~10³ nodes) → World Wide Web (~10¹² nodes); neural circuits (~10⁴ neurons) → human brain (~10¹¹ neurons).
F5 — Falsifier. A large adaptive network (≥10⁴ nodes, evolving under selection pressure) that is demonstrably neither small-world (high average path length, low clustering) nor approximately scale-free in degree distribution. If such networks are common and functional, the convergence claim weakens.
F6 — Rival (strongest form). Network properties are statistical artifacts of growth processes, not deep structural principles. Preferential attachment (Barabasi-Albert) produces power-law degree distributions, but so do many other growth mechanisms. More critically: Clauset, Shalizi & Newman (2009) SIAM Review 51:661 showed that many claimed scale-free networks do not survive rigorous statistical fitting. The “scale-free” property is often an artifact of log-binning or insufficient data. Small-worldness is more robust but may be a trivial consequence of sparse random graphs with local clustering. CITED.
F7 — Independence. HIGH — with caveat. Euler (mathematics, 1736 — founding graph theory), Watts-Strogatz (sociology/applied math, Cornell, 1998), and Barabasi (physics, Notre Dame, 1999) arrived independently. BUT: all employ graph theory — this is a shared mathematical framework, a hidden common cause. The independence assessment is HIGH for the empirical discoveries (small-world, preferential attachment); MODERATE for the formal framework.
F8 — Pattern type. Mathematical.
F9 — Maps. A3 (pattern-dynamics), A7 (pattern geometry).
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- Convergence Edge 9: Branching ↔ Networks
- Convergence Edge 8: Scale Invariance ↔ Networks
- Node C11: Networks / Small-World / Scale-Free
- Invariant 3.16 — Networks / small-world / scale-free
- Convergence Encyclopedia: C12 — Autopoiesis / Self-Production
- Convergence Encyclopedia: C10 — Scale Invariance / Fractals / Allometry
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