When.com Web Search

Search results

  1. Results From The WOW.Com Content Network
  2. Characteristic class - Wikipedia

    en.wikipedia.org/wiki/Characteristic_class

    Characteristic classes are elements of cohomology groups; [1] one can obtain integers from characteristic classes, called characteristic numbers. Some important examples of characteristic numbers are Stiefel–Whitney numbers , Chern numbers , Pontryagin numbers , and the Euler characteristic .

  3. Forensic footwear evidence - Wikipedia

    en.wikipedia.org/wiki/Forensic_footwear_evidence

    If class characteristics, size match and randomly acquired characteristics found in the footwear outsole can also be found in the crime scene impressions: Investigators can determine that the specific piece created the crime scene impression. This relationship can be used as evidence to prove that the footwear's owner was at the crime scene.

  4. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    Quizlet was founded in 2005 by Andrew Sutherland as a studying tool to aid in memorization for his French class, which he claimed to have "aced". [6] [7] [8] Quizlet's blog, written mostly by Andrew in the earlier days of the company, claims it had reached 50,000 registered users in 252 days online. [9]

  5. Todd class - Wikipedia

    en.wikipedia.org/wiki/Todd_class

    In mathematics, the Todd class is a certain construction now considered a part of the theory in algebraic topology of characteristic classes.The Todd class of a vector bundle can be defined by means of the theory of Chern classes, and is encountered where Chern classes exist — most notably in differential topology, the theory of complex manifolds and algebraic geometry.

  6. Category:Characteristic classes - Wikipedia

    en.wikipedia.org/wiki/Category:Characteristic...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  7. Scientific theory - Wikipedia

    en.wikipedia.org/wiki/Scientific_theory

    The defining characteristic of all scientific knowledge, including theories, is the ability to make falsifiable or testable predictions. [13] The relevance and specificity of those predictions determine how potentially useful the theory is. A would-be theory that makes no observable predictions is not a scientific theory at all.

  8. Crystalline cohomology - Wikipedia

    en.wikipedia.org/wiki/Crystalline_cohomology

    The motivation for this is that it can then be calculated by taking a local lifting of a scheme from characteristic p to characteristic 0 and employing an appropriate version of algebraic de Rham cohomology. Crystalline cohomology only works well for smooth proper schemes. Rigid cohomology extends it to more general schemes.

  9. Stiefel–Whitney class - Wikipedia

    en.wikipedia.org/wiki/Stiefel–Whitney_class

    The Stiefel–Whitney class was named for Eduard Stiefel and Hassler Whitney and is an example of a /-characteristic class associated to real vector bundles. In algebraic geometry one can also define analogous Stiefel–Whitney classes for vector bundles with a non-degenerate quadratic form, taking values in etale cohomology groups or in Milnor ...