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  2. Sphere packing in a sphere - Wikipedia

    en.wikipedia.org/wiki/Sphere_packing_in_a_sphere

    Sphere packing in a sphere is a three-dimensional packing problem with the objective of packing a given number of equal spheres inside a unit sphere. It is the three-dimensional equivalent of the circle packing in a circle problem in two dimensions.

  3. Sphere packing - Wikipedia

    en.wikipedia.org/wiki/Sphere_packing

    The strictly jammed (mechanically stable even as a finite system) regular sphere packing with the lowest known density is a diluted ("tunneled") fcc crystal with a density of only π √ 2 /9 ≈ 0.49365. [6] The loosest known regular jammed packing has a density of approximately 0.0555. [7]

  4. List of academic databases and search engines - Wikipedia

    en.wikipedia.org/wiki/List_of_academic_databases...

    FREE Resources: 3 articles every 2 weeks (Register and Read Program, archived journals). Also, early journals (prior to 1923 in US, 1870 elsewhere) free, no registry necessary. Free and Subscription JSTOR [89] Jurn: Multidisciplinary Jurn is a free-to-use online search tool for finding and downloading free full-text scholarly works.

  5. Help:Searching/Features - Wikipedia

    en.wikipedia.org/wiki/Help:Searching/Features

    But "exact phrase"~1 matches the wording in that order plus allows any one extra word to fall between the two words. For example "exact second phrase"~2 allows two extra words to fit anywhere on either side of the second term. "exact phrase"~3 also finds "phrase exact" (the two words in reverse order) Looking for either "Shift-Alt-P" or "Alt ...

  6. 3-sphere - Wikipedia

    en.wikipedia.org/wiki/3-sphere

    The four Euclidean coordinates for S 3 are redundant since they are subject to the condition that x 0 2 + x 1 2 + x 2 2 + x 3 2 = 1. As a 3-dimensional manifold one should be able to parameterize S 3 by three coordinates, just as one can parameterize the 2-sphere using two coordinates (such as latitude and longitude).

  7. n-sphere - Wikipedia

    en.wikipedia.org/wiki/N-sphere

    2-sphere wireframe as an orthogonal projection Just as a stereographic projection can project a sphere's surface to a plane, it can also project a 3-sphere into 3-space. This image shows three coordinate directions projected to 3-space: parallels (red), meridians (blue), and hypermeridians (green).

  8. Help:Find sources - Wikipedia

    en.wikipedia.org/wiki/Help:Find_sources

    Installing the Unpaywall extension on your browser helps you find the full text of the articles wherever you found them. WorldCat has millions of books and journal articles, and if you register for a free account, it will show you the closest libraries to you that have the source your are looking for.

  9. Wikipedia:Tools - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Tools

    3 Google tools. Toggle Google tools subsection ... 7.2.1.1 2007 and ... Mirrors of Wikimedia content can be filtered from Google search result pages in Firefox using ...