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  2. Atiyah–Singer index theorem - Wikipedia

    en.wikipedia.org/wiki/Atiyah–Singer_index_theorem

    In differential geometry, the Atiyah–Singer index theorem, proved by Michael Atiyah and Isadore Singer (1963), [1] states that for an elliptic differential operator on a compact manifold, the analytical index (related to the dimension of the space of solutions) is equal to the topological index (defined in terms of some topological data).

  3. k-nearest neighbors algorithm - Wikipedia

    en.wikipedia.org/wiki/K-nearest_neighbors_algorithm

    The crosses are the class-outliers selected by the (3,2)NN rule (all the three nearest neighbors of these instances belong to other classes); the squares are the prototypes, and the empty circles are the absorbed points. The left bottom corner shows the numbers of the class-outliers, prototypes and absorbed points for all three classes.

  4. Matrix calculus - Wikipedia

    en.wikipedia.org/wiki/Matrix_calculus

    In mathematics, matrix calculus is a specialized notation for doing multivariable calculus, especially over spaces of matrices.It collects the various partial derivatives of a single function with respect to many variables, and/or of a multivariate function with respect to a single variable, into vectors and matrices that can be treated as single entities.

  5. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    2. Equivalence class: given an equivalence relation, [] often denotes the equivalence class of the element x. 3. Integral part: if x is a real number, [] often denotes the integral part or truncation of x, that is, the integer obtained by removing all digits after the decimal mark.

  6. Polyhedron - Wikipedia

    en.wikipedia.org/wiki/Polyhedron

    This class may be subdivided into a regular, quasi-regular, or semi-regular polyhedron, and may be convex or starry. The dual is face-transitive and has regular vertices but is not necessarily vertex-transitive. The uniform polyhedra and their duals are traditionally classified according to their degree of symmetry, and whether they are convex ...

  7. S&P 500 - Wikipedia

    en.wikipedia.org/wiki/S&P_500

    A linear chart of the S&P 500 daily closing values from January 3, 1950, to February 19, 2016 A logarithmic chart of the S&P 500 index daily closing values from January 3, 1950, to February 19, 2016 A daily volume chart of the S&P 500 index from January 3, 1950, to February 19, 2016 S&P 500 Max Min Chart to Jan 2025 with Trend, with plots less Inflation, and comparison plots

  8. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    These problems, spanning many areas of mathematics, formed a central focus for much of 20th-century mathematics. Today, 10 have been solved, 7 are partially solved, and 2 are still open. The remaining 4 are too loosely formulated to be stated as solved or not. [citation needed] A map illustrating the Four Color Theorem

  9. List of African countries by life expectancy - Wikipedia

    en.wikipedia.org/wiki/List_of_African_countries...

    Estimation of the World Bank Group for 2022. [2] [3] [4] The data is filtered according to the list of countries in Africa.The values in the World Bank Group tables are rounded.

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