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  2. Rotation matrix - Wikipedia

    en.wikipedia.org/wiki/Rotation_matrix

    Noting that any identity matrix is a rotation matrix, and that matrix multiplication is associative, we may summarize all these properties by saying that the n × n rotation matrices form a group, which for n > 2 is non-abelian, called a special orthogonal group, and denoted by SO(n), SO(n,R), SO n, or SO n (R), the group of n × n rotation ...

  3. Rotation formalisms in three dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotation_formalisms_in...

    The most external matrix rotates the other two, leaving the second rotation matrix over the line of nodes, and the third one in a frame comoving with the body. There are 3 × 3 × 3 = 27 possible combinations of three basic rotations but only 3 × 2 × 2 = 12 of them can be used for representing arbitrary 3D rotations as Euler angles.

  4. Transformation matrix - Wikipedia

    en.wikipedia.org/wiki/Transformation_matrix

    In other words, the matrix of the combined transformation A followed by B is simply the product of the individual matrices. When A is an invertible matrix there is a matrix A −1 that represents a transformation that "undoes" A since its composition with A is the identity matrix. In some practical applications, inversion can be computed using ...

  5. Point groups in three dimensions - Wikipedia

    en.wikipedia.org/wiki/Point_groups_in_three...

    The groups D 2 and D 2h are noteworthy in that there is no special rotation axis. Rather, there are three perpendicular 2-fold axes. D 2 is a subgroup of all the polyhedral symmetries (see below), and D 2h is a subgroup of the polyhedral groups T h and O h. D 2 occurs in molecules such as twistane and in homotetramers such as Concanavalin A.

  6. Helmert transformation - Wikipedia

    en.wikipedia.org/wiki/Helmert_transformation

    The transformation from a reference frame 1 to a reference frame 2 can be described with three translations Δx, Δy, Δz, three rotations Rx, Ry, Rz and a scale parameter μ. The Helmert transformation (named after Friedrich Robert Helmert , 1843–1917) is a geometric transformation method within a three-dimensional space .

  7. Procrustes analysis - Wikipedia

    en.wikipedia.org/wiki/Procrustes_analysis

    The shape of an object can be considered as a member of an equivalence class formed by taking the set of all sets of k points in n dimensions, that is R kn and factoring out the set of all translations, rotations and scalings. A particular representation of shape is found by choosing a particular representation of the equivalence class.

  8. Shear mapping - Wikipedia

    en.wikipedia.org/wiki/Shear_mapping

    Thus every shear matrix has an inverse, and the inverse is simply a shear matrix with the shear element negated, representing a shear transformation in the opposite direction. In fact, this is part of an easily derived more general result: if S is a shear matrix with shear element λ, then S n is a shear matrix whose shear element is simply nλ.

  9. Three-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Three-dimensional_space

    The simplest instance is PG(3,2), which has Fano planes as its 2-dimensional subspaces. It is an instance of Galois geometry, a study of projective geometry using finite fields. Thus, for any Galois field GF(q), there is a projective space PG(3,q) of three dimensions.

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