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  2. 3-torus - Wikipedia

    en.wikipedia.org/wiki/3-torus

    All of the cubes in the image are the same cube, since light in the manifold wraps around into closed loops. The three-dimensional torus , or 3-torus , is defined as any topological space that is homeomorphic to the Cartesian product of three circles, T 3 = S 1 × S 1 × S 1 . {\displaystyle \mathbb {T} ^{3}=S^{1}\times S^{1}\times S^{1}.}

  3. Montessori sensorial materials - Wikipedia

    en.wikipedia.org/wiki/Montessori_sensorial_materials

    There are three color boxes. The first has the three primary colors (red, blue, and yellow). The second has 12 different colors. The third box has nine colors, but in different grades from light to dark. Geometric solids Ten Geometric three-dimensional shapes made from wood and usually painted blue. The shapes are: Sphere; Cone; Ovoid; Ellipsoid

  4. Cube - Wikipedia

    en.wikipedia.org/wiki/Cube

    The cube is the three-dimensional hypercube, a family of polytopes also including the two-dimensional square and four-dimensional tesseract. A cube with unit side length is the canonical unit of volume in three-dimensional space, relative to which other solid objects are measured. The cube can be represented in many ways, one of which is the ...

  5. Cubic - Wikipedia

    en.wikipedia.org/wiki/Cubic

    Cube, a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex Cubic crystal system, a crystal system where the unit cell is in the shape of a cube; Cubic function, a polynomial function of degree three; Cubic equation, a polynomial equation (reducible to ax 3 + bx 2 + cx + d = 0)

  6. Solid geometry - Wikipedia

    en.wikipedia.org/wiki/Solid_geometry

    A solid figure is the region of 3D space bounded by a two-dimensional closed surface; for example, a solid ball consists of a sphere and its interior. Solid geometry deals with the measurements of volumes of various solids, including pyramids, prisms (and other polyhedrons), cubes, cylinders, cones (and truncated cones). [2]

  7. 3-manifold - Wikipedia

    en.wikipedia.org/wiki/3-manifold

    In mathematics, a 3-manifold is a topological space that locally looks like a three-dimensional Euclidean space. A 3-manifold can be thought of as a possible shape of the universe. Just as a sphere looks like a plane (a tangent plane) to a small and close enough observer, all 3-manifolds look like our universe does to a small enough observer ...