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    from algebric topology

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    تاريخ التسجيل : 05/04/2008

    m15 from algebric topology

    مُساهمة من طرف teacher في الجمعة 16 مايو 2008, 5:17 pm

    Some useful notions from algebraic topology
    See also list of algebraic topology topics.


    • Homology and cohomology: Betti numbers, Euler characteristic.
    • Intuitively-attractive applications: Brouwer fixed-point theorem, Hairy ball theorem, Borsuk-Ulam theorem, Ham sandwich theorem.
    • Homotopy groups (including the fundamental group).
    • Chern classes, Stiefel-Whitney classes, Pontryagin classes.



    [edit] Generalizations

    Occasionally, one needs to use the tools of topology but a "set of points" is not available. In pointless topology one considers instead the lattice of open sets as the basic notion of the theory, while Grothendieck topologies are certain structures defined on arbitrary categories which allow the definition of sheaves on those categories, and with that the definition of quite general cohomology theories.

    [edit] Topology in Works of Art and Literature



    • Some M. C. Escher works illustrate topological concepts, such as Möbius strips and non-orientable spaces.
    • Both Philip K. Dick's A Scanner Darkly and Robert Anton Wilson's Schrodinger's Cat trilogy reference topological ideas.

    sunny


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    تاريخ التسجيل : 27/03/2008

    m15 رد: from algebric topology

    مُساهمة من طرف Asmaa Mahmoud في السبت 17 مايو 2008, 4:44 pm

    thank's alot shady
    u r very strong in your topics


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      الوقت/التاريخ الآن هو الخميس 08 ديسمبر 2016, 1:52 pm