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  2. Transformation geometry - Wikipedia

    en.wikipedia.org/wiki/Transformation_geometry

    A reflection against an axis followed by a reflection against a second axis not parallel to the first one results in a total motion that is a rotation around the point of intersection of the axes. In mathematics, transformation geometry (or transformational geometry) is the name of a mathematical and pedagogic take on the study of geometry by ...

  3. Inversive geometry - Wikipedia

    en.wikipedia.org/wiki/Inversive_geometry

    Inversive geometry. In geometry, inversive geometry is the study of inversion, a transformation of the Euclidean plane that maps circles or lines to other circles or lines and that preserves the angles between crossing curves. Many difficult problems in geometry become much more tractable when an inversion is applied.

  4. Orthogonal transformation - Wikipedia

    en.wikipedia.org/wiki/Orthogonal_transformation

    Orthogonal transformation. In linear algebra, an orthogonal transformation is a linear transformation T : V → V on a real inner product space V, that preserves the inner product. That is, for each pair u, v of elements of V, we have [1] {\displaystyle \langle u,v\rangle =\langle Tu,Tv\rangle \,.} Since the lengths of vectors and the angles ...

  5. Geometric transformation - Wikipedia

    en.wikipedia.org/wiki/Geometric_transformation

    Geometric transformation. In mathematics, a geometric transformation is any bijection of a set to itself (or to another such set) with some salient geometrical underpinning, such as preserving distances, angles, or ratios (scale). More specifically, it is a function whose domain and range are sets of points — most often both or both — such ...

  6. Translation (geometry) - Wikipedia

    en.wikipedia.org/wiki/Translation_(geometry)

    In Euclidean geometry, a translation is a geometric transformation that moves every point of a figure, shape or space by the same distance in a given direction. A translation can also be interpreted as the addition of a constant vector to every point, or as shifting the origin of the coordinate system. In a Euclidean space, any translation is ...

  7. Isometry - Wikipedia

    en.wikipedia.org/wiki/Isometry

    Translation T is a direct isometry: a rigid motion. [1] In mathematics, an isometry (or congruence, or congruent transformation) is a distance -preserving transformation between metric spaces, usually assumed to be bijective. [a] The word isometry is derived from the Ancient Greek: ἴσος isos meaning "equal", and μέτρον metron meaning ...

  8. Invariant (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Invariant_(mathematics)

    In mathematics, an invariant is a property of a mathematical object (or a class of mathematical objects) which remains unchanged after operations or transformations of a certain type are applied to the objects. [1][2] The particular class of objects and type of transformations are usually indicated by the context in which the term is used. For ...

  9. Erlangen program - Wikipedia

    en.wikipedia.org/wiki/Erlangen_program

    In mathematics, the Erlangen program is a method of characterizing geometries based on group theory and projective geometry. It was published by Felix Klein in 1872 as Vergleichende Betrachtungen über neuere geometrische Forschungen. It is named after the University Erlangen-Nürnberg, where Klein worked. By 1872, non-Euclidean geometries had ...

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