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  "title": "One rhythm at large gain",
  "shortTitle": "Wilhelm–Heinrich large-gain uniqueness",
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  "oneLine": "Convex geometry and exact stability formulas establish one attracting cycle in an explicit parameter region; the full uniqueness question remains open.",
  "abstract": "For positive rates r0 >= 1000 max(a0,b0)^2/min(a0,b0), this candidate proves one attracting positive periodic orbit of the Wilhelm–Heinrich oscillator. The positive-interior attractor is a convex-function graph, with a disk domain only above Hopf. Exact Floquet formulas and a source-mapped local slow-graph result accompany the large-gain theorem. Selected scalar constants have rational interval bounds; finite orbit computations remain diagnostics. The intermediate parameter region is unresolved.",
  "datePublished": "2026-10-03",
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    "name": "Does the Wilhelm–Heinrich oscillator have exactly one cycle at every oscillatory parameter?",
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  "relatedWorks": [
    {
      "citation": "Smith (2012). Global dynamics of the smallest chemical reaction system with Hopf bifurcation. Permanence, finiteness and convergence; the cycle-count question remains open in this source.",
      "url": "https://doi.org/10.1007/s10910-011-9946-9",
      "doi": "10.1007/s10910-011-9946-9"
    },
    {
      "citation": "Boros and Hofbauer (2023). Some minimal bimolecular mass-action systems with limit cycles. Theorem 13 summarizes the original model; its mass-conserving extension is a different system.",
      "url": "https://doi.org/10.1016/j.nonrwa.2023.103839",
      "doi": "10.1016/j.nonrwa.2023.103839"
    },
    {
      "citation": "Baigent (2019). Convex geometry of the carrying simplex for the May-Leonard map. A related convexity mechanism for face-preserving competitive maps, not a direct theorem for this flow.",
      "url": "https://doi.org/10.3934/dcdsb.2018288",
      "doi": "10.3934/dcdsb.2018288"
    },
    {
      "citation": "Mierczyński (2020). The C1 property of convex carrying simplices for competitive maps. A regularity antecedent with different face-invariance hypotheses.",
      "url": "https://doi.org/10.1017/etds.2018.85",
      "doi": "10.1017/etds.2018.85"
    },
    {
      "citation": "Eldering (2013). Normally hyperbolic invariant manifolds: the noncompact case. Theorem 3.2 and Remark 3.3 support the source-mapped local slow-graph repair.",
      "url": "https://doi.org/10.2991/978-94-6239-003-4",
      "doi": "10.2991/978-94-6239-003-4"
    },
    {
      "citation": "Wilhelm and Heinrich (1996). Mathematical analysis of the smallest chemical reaction system with Hopf bifurcation. Model and local-bifurcation antecedent; full original text not obtained in this intake.",
      "url": "https://doi.org/10.1007/BF01165179",
      "doi": "10.1007/BF01165179"
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