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  2. 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 .

  3. Andrew H. Wallace - Wikipedia

    en.wikipedia.org/wiki/Andrew_H._Wallace

    In 1965 he left Indiana to become a mathematics professor at the University of Pennsylvania, where he remained until his retirement as professor emeritus in 1986. [1] For the academic year 1964–1965 and the first five months of 1968 he was a visiting scholar at the Institute for Advanced Study .

  4. Chern class - Wikipedia

    en.wikipedia.org/wiki/Chern_class

    There are various ways of approaching the subject, each of which focuses on a slightly different flavor of Chern class. The original approach to Chern classes was via algebraic topology: the Chern classes arise via homotopy theory which provides a mapping associated with a vector bundle to a classifying space (an infinite Grassmannian in this case).

  5. Grothendieck's Galois theory - Wikipedia

    en.wikipedia.org/wiki/Grothendieck's_Galois_theory

    In the above example, a connection with classical Galois theory can be seen by regarding ^ as the profinite Galois group Gal(F /F) of the algebraic closure F of any finite field F, over F. That is, the automorphisms of F fixing F are described by the inverse limit, as we take larger and larger finite splitting fields over F .

  6. Localized Chern class - Wikipedia

    en.wikipedia.org/wiki/Localized_Chern_class

    In algebraic geometry, a localized Chern class is a variant of a Chern class, that is defined for a chain complex of vector bundles as opposed to a single vector bundle.It was originally introduced in Fulton's intersection theory, [1] as an algebraic counterpart of the similar construction in algebraic topology.

  7. Glossary of algebraic topology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_algebraic_topology

    edit] * The base point of a based space. X + {\displaystyle X_{+}} For an unbased space X, X + is the based space obtained by adjoining a disjoint base point. A absolute neighborhood retract abstract 1. Abstract homotopy theory Adams 1. John Frank Adams. 2. The Adams spectral sequence. 3. The Adams conjecture. 4. The Adams e -invariant. 5. The Adams operations. Alexander duality Alexander ...

  8. Gysin homomorphism - Wikipedia

    en.wikipedia.org/wiki/Gysin_homomorphism

    In the field of mathematics known as algebraic topology, the Gysin sequence is a long exact sequence which relates the cohomology classes of the base space, the fiber and the total space of a sphere bundle. The Gysin sequence is a useful tool for calculating the cohomology rings given the Euler class of the sphere bundle and vice versa.

  9. William Browder (mathematician) - Wikipedia

    en.wikipedia.org/wiki/William_Browder...

    William Browder (born January 6, 1934) [1] [2] is an American mathematician, specializing in algebraic topology, differential topology and differential geometry.Browder was one of the pioneers with Sergei Novikov, Dennis Sullivan and C. T. C. Wall of the surgery theory method for classifying high-dimensional manifolds.