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  2. 5-manifold - Wikipedia

    en.wikipedia.org/wiki/5-manifold

    In dimension 5, the smooth classification of simply connected manifolds is governed by classical algebraic topology. Namely, two simply connected, smooth 5-manifolds are diffeomorphic if and only if there exists an isomorphism of their second homology groups with integer coefficients, preserving the linking form and the second Stiefel–Whitney ...

  3. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    16. Problem of the topology of algebraic curves and surfaces. 17. Expression of definite forms by squares. 18. Building up of space from congruent polyhedra. 19. Are the solutions of regular problems in the calculus of variations always necessarily analytic? 20. The general problem of boundary values (Boundary value problems in PD) 21.

  4. Topological group - Wikipedia

    en.wikipedia.org/wiki/Topological_group

    Using the smooth structure, one can define the Lie algebra of G, an object of linear algebra that determines a connected group G up to covering spaces. As a result, the solution to Hilbert's fifth problem reduces the classification of topological groups that are topological manifolds to an algebraic problem, albeit a complicated problem in general.

  5. Smale's problems - Wikipedia

    en.wikipedia.org/wiki/Smale's_problems

    Smale's problems is a list of eighteen unsolved problems in mathematics proposed by Steve Smale in 1998 [1] and republished in 1999. [2] Smale composed this list in reply to a request from Vladimir Arnold, then vice-president of the International Mathematical Union, who asked several mathematicians to propose a list of problems for the 21st century.

  6. Timeline of manifolds - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_manifolds

    Module theory and general chain complexes are developed by Noether and her students, and algebraic topology begins as an axiomatic approach grounded in abstract algebra. 1931: Georges de Rham: De Rham's theorem: for a compact differential manifold, the chain complex of differential forms computes the real (co)homology groups. [26] 1931: Heinz Hopf

  7. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  8. Algebraic topology - Wikipedia

    en.wikipedia.org/wiki/Algebraic_topology

    Algebraic topology is a branch of mathematics that uses tools from abstract algebra to study topological spaces. The basic goal is to find algebraic invariants that classify topological spaces up to homeomorphism , though usually most classify up to homotopy equivalence .

  9. Nerve (category theory) - Wikipedia

    en.wikipedia.org/wiki/Nerve_(category_theory)

    If X is a topological space with open cover U i, ... "The realization space of a -algebra: a moduli problem in algebraic topology." Topology 43 (2004), no. 4, 857–892.

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