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  2. List of interactive geometry software - Wikipedia

    en.wikipedia.org/wiki/List_of_interactive...

    It is available free of charge for non-commercial users. [6] License: open source under GPL license (free of charge) Languages: 55; Geometry: points, lines, all conic sections, vectors, parametric curves, locus lines; Algebra: direct input of inequalities, implicit polynomials, linear and quadratic equations; calculations with numbers, points ...

  3. Open Library - Wikipedia

    en.wikipedia.org/wiki/Open_Library

    Open Library is an online project intended to create "one web page for every book ever published". Created by Aaron Swartz, [3] [4] Brewster Kahle, [5] Alexis Rossi, [6] Anand Chitipothu, [6] and Rebecca Hargrave Malamud, [6] Open Library is a project of the Internet Archive, a nonprofit organization.

  4. Right-hand rule - Wikipedia

    en.wikipedia.org/wiki/Right-hand_rule

    In mathematics and physics, the right-hand rule is a convention and a mnemonic, utilized to define the orientation of axes in three-dimensional space and to determine the direction of the cross product of two vectors, as well as to establish the direction of the force on a current-carrying conductor in a magnetic field.

  5. Triple product - Wikipedia

    en.wikipedia.org/wiki/Triple_product

    The three vectors spanning a parallelepiped have triple product equal to its volume. (However, beware that the direction of the arrows in this diagram are incorrect.) In exterior algebra and geometric algebra the exterior product of two vectors is a bivector, while the exterior product of three vectors is a trivector. A bivector is an oriented ...

  6. Category:Book websites - Wikipedia

    en.wikipedia.org/wiki/Category:Book_websites

    Download QR code; Print/export Download as PDF; Printable version ... This category contains articles about websites which sell or find printed books or provide free ...

  7. Three-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Three-dimensional_space

    The cross product or vector product is a binary operation on two vectors in three-dimensional space and is denoted by the symbol ×. The cross product A × B of the vectors A and B is a vector that is perpendicular to both and therefore normal to the plane containing them.

  8. Wikipedia:List of free online resources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:List_of_free...

    ipl2 - merger of the collections of resources from the Internet Public Library (IPL) and the Librarians' Internet Index (LII) websites, hosted by Drexel University College of Information Science and Technology; Refdesk - free and family-friendly web site that indexes and reviews quality, credible, and current web-based resources

  9. Interactive children's book - Wikipedia

    en.wikipedia.org/wiki/Interactive_children's_book

    There are now a plethora of e-book sites that place children's picture books, along with LeapFrog-like sound effects and word pronunciation, completely online-often for free. Some will actually read an entire story aloud. These "virtual libraries have done a lot to both preserve books and make them more available.