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  2. Lists of uniform tilings on the sphere, plane, and hyperbolic ...

    en.wikipedia.org/wiki/Lists_of_uniform_tilings...

    Special cases are right triangles (p q 2). Uniform solutions are constructed by a single generator point with 7 positions within the fundamental triangle, the 3 corners, along the 3 edges, and the triangle interior. All vertices exist at the generator, or a reflected copy of it. Edges exist between a generator point and its image across a mirror.

  3. Homotopy groups of spheres - Wikipedia

    en.wikipedia.org/wiki/Homotopy_groups_of_spheres

    The Hopf fibration is a nontrivial mapping of the 3-sphere to the 2-sphere, and generates the third homotopy group of the 2-sphere. This picture mimics part of the Hopf fibration, an interesting mapping from the three-dimensional sphere to the two-dimensional sphere. This mapping is the generator of the third homotopy group of the 2-sphere.

  4. Geodesic polyhedron - Wikipedia

    en.wikipedia.org/wiki/Geodesic_polyhedron

    Calculating a single PPT allows the entire figure to be created. The frequency of a geodesic polyhedron is defined by the sum of ν = b + c. A harmonic is a subfrequency and can be any whole divisor of ν. Class II always have a harmonic of 2, since ν = 2b. The triangulation number is T = b 2 + bc + c 2. This number times the number of ...

  5. Apollonian gasket - Wikipedia

    en.wikipedia.org/wiki/Apollonian_gasket

    The Möbius transformations of the plane preserve the shapes and tangencies of circles, and therefore preserve the structure of an Apollonian gasket. Any two triples of mutually tangent circles in an Apollonian gasket may be mapped into each other by a Möbius transformation, and any two Apollonian gaskets may be mapped into each other by a Möbius transformation.

  6. Kissing number - Wikipedia

    en.wikipedia.org/wiki/Kissing_number

    For a given sphere packing (arrangement of spheres) in a given space, a kissing number can also be defined for each individual sphere as the number of spheres it touches. For a lattice packing the kissing number is the same for every sphere, but for an arbitrary sphere packing the kissing number may vary from one sphere to another.

  7. Trump Doesn't Stand for Obama but Then Chats with Him ... - AOL

    www.aol.com/trump-doesnt-stand-obama-then...

    The five living U.S. presidents — Joe Biden, Donald Trump, Barack Obama, George W. Bush and Bill Clinton — reunited to honor the life and legacy of Jimmy Carter. On Thursday, Jan. 9, a date ...

  8. 18-Year-Old Charged with Double Murder of Teen Stepsisters ...

    www.aol.com/18-old-charged-double-murder...

    A suspect has been arrested following the reported shooting of Alabama stepsisters Kayden Lynch, 19, and Madison Daly, 18, on Christmas Eve. Per Lee County outlet The Observer, 18-year-old Jalen ...

  9. Puncture (topology) - Wikipedia

    en.wikipedia.org/wiki/Puncture_(topology)

    Examples of punctured manifolds include the open disk (which is a sphere with a single puncture), the cylinder (which is a sphere with two punctures), [1] and the Möbius strip (which is a projective plane with a single puncture).