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  2. Rotations and reflections in two dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotations_and_reflections...

    A point P has coordinates (x, y) with respect to the original system and coordinates (x′, y′) with respect to the new system. [1] In the new coordinate system, the point P will appear to have been rotated in the opposite direction, that is, clockwise through the angle . A rotation of axes in more than two dimensions is defined similarly.

  3. Two-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Two-dimensional_space

    A two-dimensional space is a mathematical space with two dimensions, meaning points have two degrees of freedom: their locations can be locally described with two coordinates or they can move in two independent directions. Common two-dimensional spaces are often called planes, or, more generally, surfaces. These include analogs to physical ...

  4. Point groups in two dimensions - Wikipedia

    en.wikipedia.org/wiki/Point_groups_in_two_dimensions

    For each of the types D 1, D 2, and D 4 the distinction between the 3, 4, and 2 wallpaper groups, respectively, is determined by the translation vector associated with each reflection in the group: since isometries are in the same coset regardless of translational components, a reflection and a glide reflection with the same mirror are in the ...

  5. Euclidean plane - Wikipedia

    en.wikipedia.org/wiki/Euclidean_plane

    The hypersphere in 2 dimensions is a circle, sometimes called a 1-sphere (S 1) because it is a one-dimensional manifold. In a Euclidean plane, it has the length 2π r and the area of its interior is

  6. Space (mathematics) - Wikipedia

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

    It is not always clear whether a given mathematical object should be considered as a geometric "space", or an algebraic "structure". A general definition of "structure", proposed by Bourbaki , [ 2 ] embraces all common types of spaces, provides a general definition of isomorphism, and justifies the transfer of properties between isomorphic ...

  7. Equivalent definitions of mathematical structures - Wikipedia

    en.wikipedia.org/wiki/Equivalent_definitions_of...

    In particular, the set of all structures of a given species on a given set is invariant under the action of the permutation group on the corresponding scale set S X, and is a fixed point of the action of the group on another scale set P(S X). However, not all fixed points of this action correspond to species of structures. [details 5]

  8. Codimension - Wikipedia

    en.wikipedia.org/wiki/Codimension

    Codimension is a relative concept: it is only defined for one object inside another. There is no “codimension of a vector space (in isolation)”, only the codimension of a vector subspace. If W is a linear subspace of a finite-dimensional vector space V, then the codimension of W in V is the difference between the dimensions: [1]

  9. Blichfeldt's theorem - Wikipedia

    en.wikipedia.org/wiki/Blichfeldt's_theorem

    However, in many cases a given non-convex set has a subset that is larger than , whose pairwise differences belong to . When this is the case, the larger size of Y {\displaystyle Y} relative to 1 2 K {\displaystyle {\tfrac {1}{2}}K} leads to tighter bounds on how big X {\displaystyle X} needs to be sure of containing a lattice point.