Dynamical systems

Outer billiards

Outer billiards is a dynamical system based on a convex shape in the plane. Classically, this system is defined for the Euclidean plane but one can also consider the system in the hyperbolic plane or in other spaces that suitably generalize the plane. Outer billiards differs from a usual dynamical billiard in that it deals with a discrete sequence of moves outside the shape rather than inside of it. (Wikipedia).

Outer billiards
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Outer measures - Part 2: Examples (Measure Theory Part 21)

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Outer measures - Part 1 (Measure Theory Part 20)

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Statistics for a Sinai billiard with obstacles on a square lattice

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From playlist Particles in billiards

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Outer measures - Part 3: Proof (Measure Theory Part 22)

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From playlist Measure Theory

Related pages

Inverse function | Dynamical system | Ellipse | Convex polygon | Differentiable function | Complex manifold | Tangent | Rational number | Hyperbolic geometry | Jürgen Moser | Trapezoid | Quadrilateral | Diagonal | Iterated function | Polygon | Euclidean plane | Illumination problem | Orbit (dynamics) | Midpoint | Dynamical billiards | Regular polygon | Disk (mathematics) | Convex set