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  2. Unit sphere - Wikipedia

    en.wikipedia.org/wiki/Unit_sphere

    The volume of the unit ball in Euclidean -space, and the surface area of the unit sphere, appear in many important formulas of analysis. The volume of the unit n {\displaystyle n} -ball, which we denote V n , {\displaystyle V_{n},} can be expressed by making use of the gamma function .

  3. Volume of an n-ball - Wikipedia

    en.wikipedia.org/wiki/Volume_of_an_n-ball

    Volumes of balls in dimensions 0 through 25; unit ball in red. In geometry, a ball is a region in a space comprising all points within a fixed distance, called the radius, from a given point; that is, it is the region enclosed by a sphere or hypersphere. An n-ball is a ball in an n-dimensional Euclidean space.

  4. Ball (mathematics) - Wikipedia

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

    A ball in n dimensions is called a hyperball or n-ball and is bounded by a hypersphere or (n−1)-sphere. Thus, for example, a ball in the Euclidean plane is the same thing as a disk, the area bounded by a circle. In Euclidean 3-space, a ball is taken to be the volume bounded by a 2-dimensional sphere. In a one-dimensional space, a ball is a ...

  5. Uniformly convex space - Wikipedia

    en.wikipedia.org/wiki/Uniformly_convex_space

    The unit sphere can be replaced with the closed unit ball in the definition. Namely, a normed vector space is uniformly convex if and only if for every < there is some > so that, for any two vectors and in the closed unit ball (i.e. ‖ ‖ and ‖ ‖) with ‖ ‖, one has ‖ + ‖ (note that, given , the corresponding value of could be smaller than the one provided by the original weaker ...

  6. Packing problems - Wikipedia

    en.wikipedia.org/wiki/Packing_problems

    In terms of inclusions of balls, the k open unit balls centered at , …, are included in a ball of radius := + (), which is minimal for this configuration. To show that this configuration is optimal, let x 1 , … , x k {\displaystyle x_{1},\dots ,x_{k}} be the centers of k disjoint open unit balls contained in a ball of radius r centered at a ...

  7. n-sphere - Wikipedia

    en.wikipedia.org/wiki/N-sphere

    An alternative given by Marsaglia is to uniformly randomly select a point ⁠ = (,, …,) ⁠ in the unit n-cube by sampling each ⁠ ⁠ independently from the uniform distribution over ⁠ (,) ⁠, computing ⁠ ⁠ as above, and rejecting the point and resampling if ⁠ ⁠ (i.e., if the point is not in the ⁠ ⁠-ball), and when a point in ...

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