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  2. Congruence (geometry) - Wikipedia

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

    In the School Mathematics Study Group system SAS is taken as one (#15) of 22 postulates. AAS (angle-angle-side): If two pairs of angles of two triangles are equal in measurement, and a pair of corresponding non-included sides are equal in length, then the triangles are congruent. AAS is equivalent to an ASA condition, by the fact that if any ...

  3. Rigid transformation - Wikipedia

    en.wikipedia.org/wiki/Rigid_transformation

    Any object will keep the same shape and size after a proper rigid transformation. All rigid transformations are examples of affine transformations. The set of all (proper and improper) rigid transformations is a mathematical group called the Euclidean group, denoted E(n) for n-dimensional Euclidean spaces. The set of rigid motions is called the ...

  4. Isometry - Wikipedia

    en.wikipedia.org/wiki/Isometry

    A reflection in a line is an opposite isometry, like R 1 or R 2 on the image. 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.

  5. Rigidity (mathematics) - Wikipedia

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

    In mathematics, a rigid collection C of mathematical objects (for instance sets or functions) is one in which every c ∈ C is uniquely determined by less information about c than one would expect. The above statement does not define a mathematical property ; instead, it describes in what sense the adjective "rigid" is typically used in ...

  6. Geometric rigidity - Wikipedia

    en.wikipedia.org/wiki/Geometric_rigidity

    The information in this section can be found in. [1] The rigidity matrix can be viewed as a linear transformation from | | to | |.The domain of this transformation is the set of | | column vectors, called velocity or displacements vectors, denoted by ′, and the image is the set of | | edge distortion vectors, denoted by ′.

  7. Rigidity - Wikipedia

    en.wikipedia.org/wiki/Rigidity

    Rigidity (mathematics), a property of a collection of mathematical objects (for instance sets or functions) Rigid body, in physics, a simplification of the concept of an object to allow for modelling; Rigid transformation, in mathematics, a rigid transformation preserves distances between every pair of points