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  2. Michael Hayden (general) - Wikipedia

    en.wikipedia.org/wiki/Michael_Hayden_(general)

    Hayden worked for a number of years as a principal at the Chertoff Group, a security consultancy, but left at the end of 2022. He serves on the board of directors of the Atlantic Council, [31] and co-founded the Michael V. Hayden Center for Intelligence, Policy, and International Security. Hayden is currently on the advisory board of NewsGuard ...

  3. Organizational structure of the Central Intelligence Agency

    en.wikipedia.org/wiki/Organizational_structure...

    In February 2008, the Director of the Central Intelligence Agency, Michael V. Hayden, sent a message to employees that Inspector General John L. Helgerson will accept increased control over the investigations by that office, saying "John has chosen to take a number of steps to heighten the efficiency, assure the quality and increase the ...

  4. Michael V. Hayden Center - Wikipedia

    en.wikipedia.org/wiki/Michael_V._Hayden_Center

    The Michael V. Hayden Center for Intelligence, Policy, and International Security (Hayden Center) is a think tank in Arlington County, Virginia focused on the intelligence community including topics related to intelligence studies education, intelligence analysis techniques, the operations of intelligence agencies, and public policy and international relations related to national security ...

  5. Foundations of geometry - Wikipedia

    en.wikipedia.org/wiki/Foundations_of_geometry

    Foundations of geometry is the study of geometries as axiomatic systems. There are several sets of axioms which give rise to Euclidean geometry or to non-Euclidean geometries. These are fundamental to the study and of historical importance, but there are a great many modern geometries that are not Euclidean which can be studied from this viewpoint.

  6. Michael Spivak - Wikipedia

    en.wikipedia.org/wiki/Michael_Spivak

    A Comprehensive Introduction to Differential Geometry, [16] [17] (1970, revised 3rd ed. 2005) The Joy of TeX: A Gourmet Guide to Typesetting with the AMS-TeX Macro package, (1990) A Hitchhiker's Guide to the Calculus, [18] (1995) Spivak, Michael (2010). Physics for mathematicians—Mechanics I. Houston, TX: Publish or Perish. ISBN 978-0-914098 ...

  7. Non-Euclidean geometry - Wikipedia

    en.wikipedia.org/wiki/Non-Euclidean_geometry

    In mathematics, non-Euclidean geometry consists of two geometries based on axioms closely related to those that specify Euclidean geometry.As Euclidean geometry lies at the intersection of metric geometry and affine geometry, non-Euclidean geometry arises by either replacing the parallel postulate with an alternative, or relaxing the metric requirement.

  8. Van Hiele model - Wikipedia

    en.wikipedia.org/wiki/Van_Hiele_model

    A student at Level 0 or 1 will not have the same understanding of this term. The student does not understand the teacher, and the teacher does not understand how the student is reasoning, frequently concluding that the student's answers are simply "wrong". The van Hieles believed this property was one of the main reasons for failure in geometry.

  9. Barnsley fern - Wikipedia

    en.wikipedia.org/wiki/Barnsley_fern

    Fractal fern in four states of construction. Highlighted triangles show how the half of one leaflet is transformed to half of one whole leaf or frond.. Though Barnsley's fern could in theory be plotted by hand with a pen and graph paper, the number of iterations necessary runs into the tens of thousands, which makes use of a computer practically mandatory.