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  2. Sphere packing - Wikipedia

    en.wikipedia.org/wiki/Sphere_packing

    Here there is a choice between separating the spheres into regions of close-packed equal spheres, or combining the multiple sizes of spheres into a compound or interstitial packing. When many sizes of spheres (or a distribution) are available, the problem quickly becomes intractable, but some studies of binary hard spheres (two sizes) are ...

  3. Close-packing of equal spheres - Wikipedia

    en.wikipedia.org/wiki/Close-packing_of_equal_spheres

    Six spheres surround an octahedral voids with three spheres coming from one layer and three spheres coming from the next layer. Structures of many simple chemical compounds, for instance, are often described in terms of small atoms occupying tetrahedral or octahedral holes in closed-packed systems that are formed from larger atoms.

  4. Sphere eversion - Wikipedia

    en.wikipedia.org/wiki/Sphere_eversion

    Smale's original proof was indirect: he identified (regular homotopy) classes of immersions of spheres with a homotopy group of the Stiefel manifold. Since the homotopy group that corresponds to immersions of S 2 {\displaystyle S^{2}} in R 3 {\displaystyle \mathbb {R} ^{3}} vanishes, the standard embedding and the inside-out one must be regular ...

  5. Geodesic polyhedron - Wikipedia

    en.wikipedia.org/wiki/Geodesic_polyhedron

    The Geometrical Foundation of Natural Structure: A source book of Design. pp. 142– 144, Figure 4-49, 50, 51 Custers of 12 spheres, 42 spheres, 92 spheres. Pugh, Antony (1976). "Chapter 6. The Geodesic Polyhedra of R. Buckminster Fuller and Related Polyhedra". Polyhedra: a visual approach. Wenninger, Magnus (1979). Spherical Models.

  6. Voided biaxial slab - Wikipedia

    en.wikipedia.org/wiki/Voided_biaxial_slab

    These void formers are most commonly made of plastic such as high-density polyethylene, and may use recycled materials. [7] The void formers are produced in a variety of shapes depending on the design of the slab. Common designs include spheres, boxes, ellipsoids and toroids. [6]

  7. Spherical geometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_geometry

    The sum of the angles of a spherical triangle is not equal to 180°. A sphere is a curved surface, but locally the laws of the flat (planar) Euclidean geometry are good approximations. In a small triangle on the face of the earth, the sum of the angles is only slightly more than 180 degrees. A sphere with a spherical triangle on it.

  8. Sphere - Wikipedia

    en.wikipedia.org/wiki/Sphere

    If f(x, y, z) = 0 and g(x, y, z) = 0 are the equations of two distinct spheres then (,,) + (,,) = is also the equation of a sphere for arbitrary values of the parameters s and t. The set of all spheres satisfying this equation is called a pencil of spheres determined by the original two spheres. In this definition a sphere is allowed to be a ...

  9. Ball-and-stick model - Wikipedia

    en.wikipedia.org/wiki/Ball-and-stick_model

    In a ball-and-stick model, the radius of the spheres is usually much smaller than the rod lengths, in order to provide a clearer view of the atoms and bonds throughout the model. As a consequence, the model does not provide a clear insight about the space occupied by the model.

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