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  2. Euclidean plane isometry - Wikipedia

    en.wikipedia.org/wiki/Euclidean_plane_isometry

    Now suppose the translations are not parallel, and that the mirror sequence is A 1, A 2 (the first translation) followed by B 1, B 2 (the second). Then A 2 and B 1 must cross, say at c; and, reassociating, we are free to pivot this inner pair around c. If we pivot 90°, an interesting thing happens: now A 1 and A 2 ′ intersect at a 90° angle ...

  3. Conjugation of isometries in Euclidean space - Wikipedia

    en.wikipedia.org/wiki/Conjugation_of_isometries...

    the conjugation of a translation by a reflection is a translation by a reflected translation vector; Thus the conjugacy class within the Euclidean group E(n) of a translation is the set of all translations by the same distance. The smallest subgroup of the Euclidean group containing all translations by a given distance is the set of all ...

  4. Rotations and reflections in two dimensions - Wikipedia

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

    A rotation in the plane can be formed by composing a pair of reflections. First reflect a point P to its image P′ on the other side of line L 1. Then reflect P′ to its image P′′ on the other side of line L 2. If lines L 1 and L 2 make an angle θ with one another, then points P and P′′ will make an angle 2θ around point O, the ...

  5. Rigid transformation - Wikipedia

    en.wikipedia.org/wiki/Rigid_transformation

    [1] [self-published source] [2] [3] The rigid transformations include rotations, translations, reflections, or any sequence of these. Reflections are sometimes excluded from the definition of a rigid transformation by requiring that the transformation also preserve the handedness of objects in the Euclidean space. (A reflection would not ...

  6. Euclidean group - Wikipedia

    en.wikipedia.org/wiki/Euclidean_group

    In these cases the determinant of A is 1. They are represented as a translation followed by a rotation, rather than a translation followed by some kind of reflection (in dimensions 2 and 3, these are the familiar reflections in a mirror line or plane, which may be taken to include the origin, or in 3D, a rotoreflection).

  7. Inversive geometry - Wikipedia

    en.wikipedia.org/wiki/Inversive_geometry

    When two parallel hyperplanes are used to produce successive reflections, the result is a translation. When two hyperplanes intersect in an (n–2)-flat, successive reflections produce a rotation where every point of the (n–2)-flat is a fixed point of each reflection and thus of the composition.

  8. Which “Home Alone” Character You Are, Based On Your Zodiac Sign

    www.aol.com/home-alone-character-based-zodiac...

    Earth signs may relate to Kevin's resourcefulness and meticulous planning when setting his traps while Air signs will feel closely aligned with E.F. Duncan, the eccentric owner of Duncan’s Toy ...

  9. Glide reflection - Wikipedia

    en.wikipedia.org/wiki/Glide_reflection

    The isometry group generated by just a glide reflection is an infinite cyclic group. [1] Combining two equal glide reflections gives a pure translation with a translation vector that is twice that of the glide reflection, so the even powers of the glide reflection form a translation group.

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