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  2. Homotopy group - Wikipedia

    en.wikipedia.org/wiki/Homotopy_group

    Then there is a long exact sequence of homotopy groups () () () Here the maps involving π 0 {\displaystyle \pi _{0}} are not group homomorphisms because the π 0 {\displaystyle \pi _{0}} are not groups, but they are exact in the sense that the image equals the kernel .

  3. Homogeneous coordinates - Wikipedia

    en.wikipedia.org/wiki/Homogeneous_coordinates

    Rational Bézier curve – polynomial curve defined in homogeneous coordinates (blue) and its projection on plane – rational curve (red) In mathematics, homogeneous coordinates or projective coordinates, introduced by August Ferdinand Möbius in his 1827 work Der barycentrische Calcul, [1] [2] [3] are a system of coordinates used in projective geometry, just as Cartesian coordinates are used ...

  4. Homogeneous function - Wikipedia

    en.wikipedia.org/wiki/Homogeneous_function

    In mathematics, a homogeneous function is a function of several variables such that the following holds: If each of the function's arguments is multiplied by the same scalar, then the function's value is multiplied by some power of this scalar; the power is called the degree of homogeneity, or simply the degree.

  5. Chain complex - Wikipedia

    en.wikipedia.org/wiki/Chain_complex

    An exact sequence (or exact complex) is a chain complex whose homology groups are all zero. This means all closed elements in the complex are exact. A short exact sequence is a bounded exact sequence in which only the groups A k, A k+1, A k+2 may be nonzero. For example, the following chain complex is a short exact sequence.

  6. Beatty sequence - Wikipedia

    en.wikipedia.org/wiki/Beatty_sequence

    In mathematics, a Beatty sequence (or homogeneous Beatty sequence) is the sequence of integers found by taking the floor of the positive multiples of a positive irrational number. Beatty sequences are named after Samuel Beatty , who wrote about them in 1926.

  7. Bianchi classification - Wikipedia

    en.wikipedia.org/wiki/Bianchi_classification

    (For a more theoretical and coordinate-independent definition of homogeneous space see homogeneous space). A space is homogeneous if it admits a set of transformations (a group of motions) that brings any given point to the position of any other point. Since space is three-dimensional the different transformations of the group are labelled by ...

  8. Hilbert series and Hilbert polynomial - Wikipedia

    en.wikipedia.org/wiki/Hilbert_series_and_Hilbert...

    Let H be the homogeneous ideal generated by the homogeneous parts of highest degree of the elements of I. If I is homogeneous, then H=I. Finally let B be a Gröbner basis of I for a monomial ordering refining the total degree partial ordering and G the (homogeneous) ideal generated by the leading monomials of the elements of B.

  9. Complete homogeneous symmetric polynomial - Wikipedia

    en.wikipedia.org/wiki/Complete_homogeneous...

    It has a ring automorphism that interchanges the sequences of the n elementary and first n complete homogeneous symmetric functions. The set of complete homogeneous symmetric polynomials of degree 1 to n in n variables generates the ring of symmetric polynomials in n variables. More specifically, the ring of symmetric polynomials with integer ...

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