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  2. Khan Academy - Wikipedia

    en.wikipedia.org/wiki/Khan_Academy

    Khan Academy is an American non-profit [3] educational organization created in 2006 by Sal Khan. [1] Its goal is to create a set of online tools that help educate students. [4] The organization produces short video lessons. [5] Its website also includes supplementary practice exercises and materials for educators.

  3. Sal Khan - Wikipedia

    en.wikipedia.org/wiki/Sal_Khan

    3. Relatives. Abdul Wahab Khan (grandfather) Salman " Sal " Amin Khan (born October 11, 1976) is an American educator and the founder of Khan Academy, a free online non-profit educational platform with which he has produced over 6,500 video lessons teaching a wide spectrum of academic subjects, originally focusing on mathematics and science. [1]

  4. Vector algebra - Wikipedia

    en.wikipedia.org/wiki/Vector_algebra

    Vector algebra. In mathematics, vector algebra may mean: The operations of vector addition and scalar multiplication of a vector space. The algebraic operations in vector calculus (vector analysis) – including the dot and cross products of 3-dimensional Euclidean space. Algebra over a field – a vector space equipped with a bilinear product.

  5. Ring (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Ring_(mathematics)

    Since the center of a simple k-algebra is a field, any simple k-algebra is a central simple algebra over its center. In this section, a central simple algebra is assumed to have finite dimension. Also, we mostly fix the base field; thus, an algebra refers to a k-algebra. The matrix ring of size n over a ring R will be denoted by R n.

  6. Quadratic formula - Wikipedia

    en.wikipedia.org/wiki/Quadratic_formula

    Quadratic formula. The roots of the quadratic function y = 1 2 x2 − 3x + 5 2 are the places where the graph intersects the x -axis, the values x = 1 and x = 5. They can be found via the quadratic formula. In elementary algebra, the quadratic formula is a closed-form expression describing the solutions of a quadratic equation.

  7. Trigonometry - Wikipedia

    en.wikipedia.org/wiki/Trigonometry

    v. t. e. Trigonometry (from Ancient Greek τρίγωνον (trígōnon) 'triangle', and μέτρον (métron) 'measure') [1] is a branch of mathematics concerned with relationships between angles and side lengths of triangles. In particular, the trigonometric functions relate the angles of a right triangle with ratios of its side lengths.

  8. Brilliant (website) - Wikipedia

    en.wikipedia.org/wiki/Brilliant_(website)

    Brilliant.org is an American for-profit company and associated community that features 100+ guided courses [2] across the site. It operates via a freemium business model. [3] Brilliant was founded in 2012. [3] At the Launch Festival in March 2013, CEO and co-founder Sue Khim presented the idea of Brilliant, attracting funding from venture ...

  9. Change of basis - Wikipedia

    en.wikipedia.org/wiki/Change_of_basis

    Change of basis. A linear combination of one basis of vectors (purple) obtains new vectors (red). If they are linearly independent, these form a new basis. The linear combinations relating the first basis to the other extend to a linear transformation, called the change of basis. A vector represented by two different bases (purple and red ...

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