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{
  "system_id": "double_pendulum",
  "name": "Double pendulum",
  "category": "chaotic",
  "equations": "Coupled second-order nonlinear equations for two angles θ1, θ2 of a planar double pendulum under gravity.",
  "parameters": {
    "m1": 1.0,
    "m2": 1.0,
    "l1": 1.0,
    "l2": 1.0,
    "g": 9.81
  },
  "description_simple": "A physical system with two connected pendulum arms that, for many initial conditions, exhibits chaotic motion.",
  "description_complex": "A deterministic mechanical system consisting of two rigid rods connected in series and free to swing in a plane under gravity. The governing equations are highly nonlinear, and for generic initial conditions the motion shows deterministic chaos: strong sensitivity to initial conditions, complex trajectories in phase space, and no simple periodic or quasi-periodic attractor.",
  "truth_assignment": {
    "Chaotic": true,
    "Deterministic": true,
    "PosLyap": true,
    "Sensitive": true,
    "StrangeAttr": true,
    "PointUnpredictable": true,
    "StatPredictable": true,
    "QuasiPeriodic": false,
    "Random": false,
    "FixedPointAttr": false,
    "Periodic": false,
    "Dissipative": true,
    "Bounded": true,
    "Mixing": true,
    "Ergodic": true,
    "HyperChaotic": false,
    "Conservative": false,
    "HighDimensional": false,
    "Multifractal": false,
    "HighDimSystem": true,
    "ContinuousTime": true,
    "DiscreteTime": false,
    "DelaySystem": false,
    "Forced": false,
    "Autonomous": true,
    "StrongMixing": true,
    "WeakMixing": true
  }
}