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  2. Birkhoff's axioms - Wikipedia

    en.wikipedia.org/wiki/Birkhoff's_axioms

    These postulates are all based on basic geometry that can be confirmed experimentally with a scale and protractor. Since the postulates build upon the real numbers, the approach is similar to a model-based introduction to Euclidean geometry. Birkhoff's axiomatic system was utilized in the secondary-school textbook by Birkhoff and Beatley. [2]

  3. William Delbert Gann - Wikipedia

    en.wikipedia.org/wiki/William_Delbert_Gann

    William Delbert Gann (June 6, 1878 – June 18, 1955) or WD Gann, was a finance trader who developed the technical analysis methods like the Gann angles [1] [2] and the Master Charts, [3] [4] where the latter is a collective name for his various tools like the Spiral Chart (also called the Square of Nine), [5] [6] [7] the Hexagon Chart, [8] and the Circle of 360.

  4. Van Hiele model - Wikipedia

    en.wikipedia.org/wiki/Van_Hiele_model

    The van Hiele levels have five properties: 1. Fixed sequence: the levels are hierarchical.Students cannot "skip" a level. [5] The van Hieles claim that much of the difficulty experienced by geometry students is due to being taught at the Deduction level when they have not yet achieved the Abstraction level.

  5. List of books in computational geometry - Wikipedia

    en.wikipedia.org/wiki/List_of_books_in...

    This is a list of books in computational geometry.There are two major, largely nonoverlapping categories: Combinatorial computational geometry, which deals with collections of discrete objects or defined in discrete terms: points, lines, polygons, polytopes, etc., and algorithms of discrete/combinatorial character are used

  6. Geometrization conjecture - Wikipedia

    en.wikipedia.org/wiki/Geometrization_conjecture

    The four finite volume manifolds with this geometry are: S 2 × S 1, the mapping torus of the antipode map of S 2, the connected sum of two copies of 3-dimensional projective space, and the product of S 1 with two-dimensional projective space. The first two are mapping tori of the identity map and antipode map of the 2-sphere, and are the only ...

  7. Six-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Six-dimensional_space

    In particular the dot product between two 6-vectors is readily defined and can be used to calculate the metric. 6 × 6 matrices can be used to describe transformations such as rotations that keep the origin fixed. More generally, any space that can be described locally with six coordinates, not necessarily Euclidean ones, is six-dimensional.

  8. The Princeton Companion to Mathematics - Wikipedia

    en.wikipedia.org/wiki/The_Princeton_Companion_to...

    The core sections of the Companion are aimed primarily at readers who are already familiar with mathematics at the undergraduate level. [ 2 ] [ 5 ] Much of the rest of the book, such as its collection of biographies, would be accessible to a mathematically inclined high school student, [ 2 ] [ 3 ] [ 6 ] and there is enough depth of coverage in ...

  9. Geometric group theory - Wikipedia

    en.wikipedia.org/wiki/Geometric_group_theory

    Geometric group theory grew out of combinatorial group theory that largely studied properties of discrete groups via analyzing group presentations, which describe groups as quotients of free groups; this field was first systematically studied by Walther von Dyck, student of Felix Klein, in the early 1880s, [2] while an early form is found in the 1856 icosian calculus of William Rowan Hamilton ...