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  2. Four-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Four-dimensional_space

    Four-dimensional space (4D) is the mathematical extension of the concept of three-dimensional space (3D). Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called dimensions, to describe the sizes or locations of objects in the everyday world.

  3. Tesseract - Wikipedia

    en.wikipedia.org/wiki/Tesseract

    In geometry, a tesseract or 4-cube is a four-dimensional hypercube, analogous to a two-dimensional square and a three-dimensional cube. [1] Just as the perimeter of the square consists of four edges and the surface of the cube consists of six square faces, the hypersurface of the tesseract consists of eight cubical cells, meeting at right angles.

  4. Hypercube - Wikipedia

    en.wikipedia.org/wiki/Hypercube

    In geometry, a hypercube is an n-dimensional analogue of a square (n = 2) and a cube (n = 3); the special case for n = 4 is known as a tesseract.It is a closed, compact, convex figure whose 1-skeleton consists of groups of opposite parallel line segments aligned in each of the space's dimensions, perpendicular to each other and of the same length.

  5. 4-polytope - Wikipedia

    en.wikipedia.org/wiki/4-polytope

    The most familiar 4-polytope is the tesseract or hypercube, the 4D analogue of the cube. The convex regular 4-polytopes can be ordered by size as a measure of 4-dimensional content (hypervolume) for the same radius.

  6. n-sphere - Wikipedia

    en.wikipedia.org/wiki/N-sphere

    For any natural number ⁠ ⁠, an ⁠ ⁠-sphere of radius ⁠ ⁠ is defined as the set of points in ⁠ (+) ⁠-dimensional Euclidean space that are at distance ⁠ ⁠ from some fixed point ⁠ ⁠, where ⁠ ⁠ may be any positive real number and where ⁠ ⁠ may be any point in ⁠ (+) ⁠-dimensional space.

  7. Regular 4-polytope - Wikipedia

    en.wikipedia.org/wiki/Regular_4-polytope

    The tesseract is one of 6 convex regular 4-polytopes. In mathematics, a regular 4-polytope or regular polychoron is a regular four-dimensional polytope.They are the four-dimensional analogues of the regular polyhedra in three dimensions and the regular polygons in two dimensions.

  8. List of regular polytopes - Wikipedia

    en.wikipedia.org/wiki/List_of_regular_polytopes

    add edges (p 0 × q 0, p 1 × q 1) where (p 0, p 1) is an edge of P and (q 0, q 1) is an edge of Q. select an arbitrary connected component of the result. Alternatively, the blend is the polygon ρ 0 σ 0, ρ 1 σ 1 where ρ and σ are the generating mirrors of P and Q placed in orthogonal subspaces. [9] The blending operation is commutative ...

  9. 5-cell - Wikipedia

    en.wikipedia.org/wiki/5-cell

    In geometry, the 5-cell is the convex 4-polytope with Schläfli symbol {3,3,3}. It is a 5-vertex four-dimensional object bounded by five tetrahedral cells. It is also known as a C 5, hypertetrahedron, pentachoron, [1] pentatope, pentahedroid, [2] tetrahedral pyramid, or 4-simplex (Coxeter's polytope), [3] the simplest possible convex 4-polytope, and is analogous to the tetrahedron in three ...