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  2. Alhazen's problem - Wikipedia

    en.wikipedia.org/wiki/Alhazen's_problem

    Alhazen's problem, also known as Alhazen's billiard problem, is a mathematical problem in geometrical optics first formulated by Ptolemy in 150 AD. [1] It is named for the 11th-century Arab mathematician Alhazen ( Ibn al-Haytham ), who presented a geometric solution in his Book of Optics .

  3. Inversive geometry - Wikipedia

    en.wikipedia.org/wiki/Inversive_geometry

    Inversion: Reflection in a Circle at cut-the-knot; Wilson Stother's inversive geometry page; IMO Compendium Training Materials practice problems on how to use inversion for math olympiad problems; Weisstein, Eric W. "Inversion". MathWorld. Visual Dictionary of Special Plane Curves Xah Lee

  4. Reflection (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Reflection_(mathematics)

    A reflection through an axis. In mathematics, a reflection (also spelled reflexion) [1] is a mapping from a Euclidean space to itself that is an isometry with a hyperplane as the set of fixed points; this set is called the axis (in dimension 2) or plane (in dimension 3) of reflection.

  5. Rotations and reflections in two dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotations_and_reflections...

    The set of all reflections in lines through the origin and rotations about the origin, together with the operation of composition of reflections and rotations, forms a group. The group has an identity: Rot(0). Every rotation Rot(φ) has an inverse Rot(−φ). Every reflection Ref(θ) is its own inverse. Composition has closure and is ...

  6. Coxeter group - Wikipedia

    en.wikipedia.org/wiki/Coxeter_group

    In mathematics, a Coxeter group, named after H. S. M. Coxeter, is an abstract group that admits a formal description in terms of reflections (or kaleidoscopic mirrors). Indeed, the finite Coxeter groups are precisely the finite Euclidean reflection groups ; for example, the symmetry group of each regular polyhedron is a finite Coxeter group.

  7. Einstein problem - Wikipedia

    en.wikipedia.org/wiki/Einstein_problem

    The strictest version of the problem was solved in 2023, after an initial discovery in 2022. The einstein problem can be seen as a natural extension of the second part of Hilbert's eighteenth problem, which asks for a single polyhedron that tiles Euclidean 3-space, but such that no tessellation by this polyhedron is isohedral. [3]

  8. Skorokhod problem - Wikipedia

    en.wikipedia.org/wiki/Skorokhod_problem

    In probability theory, the Skorokhod problem is the problem of solving a stochastic differential equation with a reflecting boundary condition. [ 1 ] The problem is named after Anatoliy Skorokhod who first published the solution to a stochastic differential equation for a reflecting Brownian motion .

  9. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

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