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  2. Lambert quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Lambert_quadrilateral

    In geometry, a Lambert quadrilateral (also known as Ibn al-Haytham–Lambert quadrilateral), [1] [2] is a quadrilateral in which three of its angles are right angles. Historically, the fourth angle of a Lambert quadrilateral was of considerable interest since if it could be shown to be a right angle, then the Euclidean parallel postulate could ...

  3. Graduate Texts in Mathematics - Wikipedia

    en.wikipedia.org/wiki/Graduate_Texts_in_Mathematics

    Graduate Texts in Mathematics (GTM) (ISSN 0072-5285) is a series of graduate-level textbooks in mathematics published by Springer-Verlag.The books in this series, like the other Springer-Verlag mathematics series, are yellow books of a standard size (with variable numbers of pages).

  4. Hilbert's axioms - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_axioms

    Removing five axioms mentioning "plane" in an essential way, namely I.4–8, and modifying III.4 and IV.1 to omit mention of planes, yields an axiomatization of Euclidean plane geometry. Hilbert's axioms, unlike Tarski's axioms, do not constitute a first-order theory because the axioms V.12 cannot be expressed in first-order logic.

  5. Rotations in 4-dimensional Euclidean space - Wikipedia

    en.wikipedia.org/wiki/Rotations_in_4-dimensional...

    The generating rotation matrix can be classified with respect to the values θ 1 and θ 2 as follows: If θ 1 = 0 and θ 2 ≠ 0 or vice versa, then the formulae generate simple rotations; If θ 1 and θ 2 are nonzero and θ 1 ≠ θ 2, then the formulae generate double rotations; If θ 1 and θ 2 are nonzero and θ 1 = θ 2, then the formulae ...

  6. 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.

  7. Hilbert's fourth problem - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_fourth_problem

    In mathematics, Hilbert's fourth problem in the 1900 list of Hilbert's problems is a foundational question in geometry.In one statement derived from the original, it was to find — up to an isomorphism — all geometries that have an axiomatic system of the classical geometry (Euclidean, hyperbolic and elliptic), with those axioms of congruence that involve the concept of the angle dropped ...

  8. First Principles of Instruction - Wikipedia

    en.wikipedia.org/wiki/First_Principles_of...

    There is a growing body of research support for Merrill's First Principles of Instruction. In one study, researchers surveyed 140 students at 89 different higher education institutions and discovered that students were 9 times more likely to report that they had mastered learning the course objectives when First Principles of Instruction were used and when they spent ample time and effort ...

  9. Geometric analysis - Wikipedia

    en.wikipedia.org/wiki/Geometric_analysis

    Saddle tower minimal surface. Minimal surfaces are among the objects of study in geometric analysis.. Geometric analysis is a mathematical discipline where tools from differential equations, especially elliptic partial differential equations (PDEs), are used to establish new results in differential geometry and differential topology.