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  1. 3-sphere - Wikipedia

    • A 3-sphere is a compact, connected, 3-dimensional manifold without boundary. It is also simply connected. What this means, in the broad sense, is that any loop, or circular path, on the 3-sphere can be continuously shrunk to a point without leaving the 3-sphere. See more

    Overview

    In mathematics, a hypersphere or 3-sphere is a 4-dimensional analogue of a sphere, and is the 3-dimensional
    It … See more

    Definition

    In coordinates, a 3-sphere with center (C0, C1, C2, C3) and radius r is the set of all points (x0, x1, x2, x3) in real, 4-dimensional space (R ) such that
    The 3-sphere centered at the origin with radius 1 is … See more

    Properties

    The 3-dimensional surface volume of a 3-sphere of radius r is
    while the 4-dimensional hypervolume (the content of the 4-dimensional region, or ball, bounded by the 3-sphere) is
    Every non-… See more

    Topological construction

    There are several well-known constructions of the three-sphere. Here we describe gluing a pair of three-balls and then the one-point compactification.
    A 3-sphere can be constructed topologically by … See more

    Coordinate systems on the 3-sphere

    The four Euclidean coordinates for S are redundant since they are subject to the condition that x0 + x1 + x2 + x3 = 1. As a 3-dimensional manifold one should be able to parameterize S by three coordinates, just as one can … See more

    Group structure

    When considered as the set of unit quaternions, S inherits an important structure, namely that of quaternionic multiplication. Because the set of unit quaternions is closed under multiplication, S takes on … See more

    In literature

    In Edwin Abbott Abbott's Flatland, published in 1884, and in Sphereland, a 1965 sequel to Flatland by Dionys Burger, the 3-sphere is referred to as an oversphere, and a 4-sphere is referred to as a hypersphere.
    Writing in the … See more

     
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  2. In mathematics, a 3-sphere, glome or hypersphere is a higher-dimensional analogue of a sphere. In 4-dimensional Euclidean space, it is the set of points equidistant from a fixed central point.
    en.wikipedia.org/wiki/3-sphere
    Just as a two-dimensional sphere is the set of all points a fixed distance from some center point in ordinary three-dimensional space, a three-dimensional sphere (or “three-sphere”) is the set of all points a fixed distance from some center point in four-dimensional space.
    www.quantamagazine.org/what-is-the-geometry-of …
    This 3-sphere is an example of a 3-manifold: a space which is 'looks locally' like 3-D space. In precise topological terms, each point of the 3-sphere has a neighborhood which is homeomorphic to an open subset of 3-D space.
    en.wikipedia.org/wiki/Three-dimensional_space
     
  3. n-sphere - Wikipedia

     
  4. What are all these "visualizations" of the 3-sphere?

    You can think of the $3$ sphere as a movie starting with a point which grows to a unit $2$-sphere which then shrinks back to a point. This can be useful. …

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    • The 3-sphere: Extrinsic and Intrinsic Forms - ThatsMaths

      Sep 22, 2022 · The 3-sphere is a compact, connected, 3-dimensional manifold without boundary. It is also simply connected: any loop on the 3-sphere can be continuously shrunk to a point without leaving the 3-sphere.

    • 3-sphere - Academic Kids

    • 3-Dimensional Space | The spherical space $S^3$

      What is the 3-sphere? The space $S^3$ is the 3-dimensional analogue of the usual sphere in 2 dimensions. It is an isotropic space (all the directions play the same role).

    • Sphere - Wikipedia

      Mathematicians consider a sphere to be a two-dimensional closed surface embedded in three-dimensional Euclidean space. They draw a distinction between a sphere and a ball, which is a solid figure, a three-dimensional …

    • Henri Poincar¿, His Conjecture, Copacabana and Higher …

    • Exploring the 3-Sphere: A Beginner's Guide to Higher Dimensions

    • Probing the 3-Sphere by a rotating sphere - YouTube

      Jun 30, 2016 · The 3-Sphere is a 3D "shell" of constant radius in 4D space, corresponding to the circle and the sphere in 2D and 3D. It cannot be visualised directly as a 3D manifold of 4D space,...

    • 3-sphere

    • 3-sphere in nLab - ncatlab.org

    • 3-Sphere - SpringerLink

    • 3-sphere - YouTube

    • 3-manifold - Wikipedia

    • 3-sphere | EPFL Graph Search

    • 3-sphère — Wikipédia

    • 9.2.2: Inner Sphere Electron Transfer - Chemistry LibreTexts

    • 3-sphere - Wikiwand

    • Sphere | Immersive Shows, Concerts & Events in Las Vegas

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