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  2. Volleyball offensive systems - Wikipedia

    en.wikipedia.org/wiki/Volleyball_Offensive_Systems

    A 5-1 takes its name from using 1 setter and having 5 attackers on the court. The secondary setter is replaced by an opposite hitter who is always opposite the setter on the court. This formation allows the setter to be able to dump the ball for half the rotations and have 3 front row attackers to set the ball to on the other three rotations.

  3. Rotation matrix - Wikipedia

    en.wikipedia.org/wiki/Rotation_matrix

    When an n × n rotation matrix Q, does not include a −1 eigenvalue, thus none of the planar rotations which it comprises are 180° rotations, then Q + I is an invertible matrix. Most rotation matrices fit this description, and for them it can be shown that ( Q − I )( Q + I ) −1 is a skew-symmetric matrix , A .

  4. Rotation of axes in two dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotation_of_axes_in_two...

    In mathematics, a rotation of axes in two dimensions is a mapping from an xy-Cartesian coordinate system to an x′y′-Cartesian coordinate system in which the origin is kept fixed and the x′ and y′ axes are obtained by rotating the x and y axes counterclockwise through an angle .

  5. After so many Wimbledon 5-setters, Novak Djokovic would ... - AOL

    www.aol.com/news/many-wimbledon-5-setters-novak...

    After so many Wimbledon 5-setters, Novak Djokovic would be OK with best-of-3 in early rounds ... John Isner's 11-hour, 5-minute defeat of Nicolas Mahut in the first round in 2010 that stretched ...

  6. Rotations in 4-dimensional Euclidean space - Wikipedia

    en.wikipedia.org/wiki/Rotations_in_4-dimensional...

    Fig.1: simple rotations (black) and left and right isoclinic rotations (red and blue) Fig.2: a general rotation with angular displacements in a ratio of 1:5 Fig.3: a general rotation with angular displacements in a ratio of 5:1 All images are stereographic projections. Every rotation in 3D space has a fixed axis unchanged by rotation.

  7. Straight-line mechanism - Wikipedia

    en.wikipedia.org/wiki/Straight-line_mechanism

    Tusi couple (1247) according to the diagrams in the translation of the copy of Tusi's original description: Small circle rolls within large circle. Tusi couple according to the translation of the copy of Tusi's original description: Circles rotate in same direction, speed ratio 1:2.

  8. Point groups in three dimensions - Wikipedia

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

    The group I is isomorphic to A 5, the alternating group on 5 letters, since its elements correspond 1-to-1 with even permutations of the five T symmetries (or the five tetrahedra just mentioned). Representing rotations with quaternions, I is made up of the 120 unit icosians. As before, this is a 1-to-2 correspondence. I h, (*532) [5,3] 5 3 2/m ...

  9. Givens rotation - Wikipedia

    en.wikipedia.org/wiki/Givens_rotation

    As rotations are applied just in the opposite order of the Euler angles table of rotations, this table is the same but swapping indexes 1 and 3 in the angles associated with the corresponding entry. An entry like zxy means to apply first the y rotation, then x , and finally z , in the basis axes.