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  2. Quizlet - Wikipedia

    en.wikipedia.org/wiki/Quizlet

    Also in 2016, Quizlet launched "Quizlet Live", a real-time online matching game where teams compete to answer all 12 questions correctly without an incorrect answer along the way. [15] In 2017, Quizlet created a premium offering called "Quizlet Go" (later renamed "Quizlet Plus"), with additional features available for paid subscribers.

  3. Hilbert's axioms - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_axioms

    We employ also the expressions: "A, B, C lie in α"; "A, B, C are points of α", etc. For every three points A, B, C which do not lie in the same line, there exists no more than one plane that contains them all. If two points A, B of a line a lie in a plane α, then every point of a lies in α. In this case we say: "The line a lies in the plane ...

  4. Thales's theorem - Wikipedia

    en.wikipedia.org/wiki/Thales's_theorem

    In geometry, Thales's theorem states that if A, B, and C are distinct points on a circle where the line AC is a diameter, the angle ∠ ABC is a right angle. Thales's theorem is a special case of the inscribed angle theorem and is mentioned and proved as part of the 31st proposition in the third book of Euclid 's Elements . [ 1 ]

  5. Foundations of geometry - Wikipedia

    en.wikipedia.org/wiki/Foundations_of_geometry

    The term axiomatic geometry can be applied to any geometry that is developed from an axiom system, but is often used to mean Euclidean geometry studied from this point of view. The completeness and independence of general axiomatic systems are important mathematical considerations, but there are also issues to do with the teaching of geometry ...

  6. Geometry - Wikipedia

    en.wikipedia.org/wiki/Geometry

    Geometry (from Ancient Greek γεωμετρία (geōmetría) 'land measurement'; from γῆ (gê) 'earth, land' and μέτρον (métron) 'a measure') [1] is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. [2]

  7. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    Also, the 4th problem concerns the foundations of geometry, in a manner that is now generally judged to be too vague to enable a definitive answer. The 23rd problem was purposefully set as a general indication by Hilbert to highlight the calculus of variations as an underappreciated and understudied field.

  8. Outline of geometry - Wikipedia

    en.wikipedia.org/wiki/Outline_of_geometry

    Geometry is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space. Geometry is one of the oldest mathematical sciences. Geometry is one of the oldest mathematical sciences.

  9. Elliptic geometry - Wikipedia

    en.wikipedia.org/wiki/Elliptic_geometry

    We obtain a model of spherical geometry if we use the metric d ( u , v ) = 2 arcsin ⁡ ( δ ( u , v ) 2 ) . {\displaystyle d(u,v)=2\arcsin \left({\frac {\delta (u,v)}{2}}\right).} Elliptic geometry is obtained from this by identifying the antipodal points u and − u / ‖ u ‖ 2 , and taking the distance from v to this pair to be the minimum ...

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