point group
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Point group — The Bauhinia blakeana flower on the Hong Kong flag has C5 symmetry; the star on each petal has D5 symmetry. In geometry, a point group is a group of geometric symmetries (isometries) that keep at least one point fixed. Point groups can exist in a … Wikipedia
point group — Crystall. a class of crystals determined by a combination of their symmetry elements, all crystals left unchanged by a given set of symmetry elements being placed in the same class. Also called symmetry class. [1900 05] * * * ▪ crystallography… … Universalium
point group — taškinė grupė statusas T sritis chemija apibrėžtis Baigtinio skaičiaus taškų išsidėstymas apie ypatingas pozicijas gardelėje, kuriam būdingas tam tikras simetrijos elementų rinkinys. atitikmenys: angl. point group rus. точечная группа … Chemijos terminų aiškinamasis žodynas
point group — taškinė grupė statusas T sritis fizika atitikmenys: angl. point group vok. Punktgruppe, f rus. точечная группа, f pranc. groupe ponctuel, m … Fizikos terminų žodynas
point group — Crystall. a class of crystals determined by a combination of their symmetry elements, all crystals left unchanged by a given set of symmetry elements being placed in the same class. Also called symmetry class. [1900 05] … Useful english dictionary
Crystallographic point group — In crystallography, a crystallographic point group is a set of symmetry operations, like rotations or reflections, that leave a central point fixed while moving other directions and faces of the crystal to the positions of features of the same… … Wikipedia
Elk Point Group — Stratigraphic range: Middle Devonian … Wikipedia
Six Point Group — The Six Point Group was a British feminist campaign group founded by Lady Rhondda in 1921 to press for changes in the law of the United Kingdom in six areas.AimsThe six original specific aims were: # Satisfactory legislation on child assault; #… … Wikipedia
Point groups in three dimensions — In geometry, a point group in three dimensions is an isometry group in three dimensions that leaves the origin fixed, or correspondingly, an isometry group of a sphere. It is a subgroup of the orthogonal group O(3), the group of all isometries… … Wikipedia
Point groups in two dimensions — In geometry, a point group in two dimensions is an isometry group in two dimensions that leaves the origin fixed, or correspondingly, an isometry group of a circle. It is a subgroup of the orthogonal group O(2), the group of all isometries which… … Wikipedia
