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Yahoo! Groups was a free-to-use system of electronic mailing lists offered by Yahoo!. Prior to February 2020, Yahoo! Groups was one of the world's largest collections of online discussion boards. It allowed members to subscribe to various groups, read subscribed discussions online, view and share photos, files and bookmarks within a group ...
t. e. In mathematics, specifically in group theory, the direct product is an operation that takes two groups G and H and constructs a new group, usually denoted G × H. This operation is the group-theoretic analogue of the Cartesian product of sets and is one of several important notions of direct product in mathematics.
orthogonal groups. Chevalley groups, Cn (q) n > 2. symplectic groups. Chevalley groups, Dn (q) n > 3. orthogonal groups. Simplicity. A1 (2) and A1 (3) are solvable, the others are simple. B2 (2) is not simple but its derived group B2 (2)′ is a simple subgroup of index 2; the others are simple. All simple.
Group (online social networking) A group (often termed as a community, e-group or club) is a feature in many social networking services which allows users to create, post, comment to and read from their own interest- and niche-specific forums, often within the realm of virtual communities. Groups, which may allow for open or closed access ...
List of space groups. There are 230 space groups in three dimensions, given by a number index, and a full name in Hermann–Mauguin notation, and a short name (international short symbol). The long names are given with spaces for readability. The groups each have a point group of the unit cell.
Point groups are used to describe the symmetries of geometric figures and physical objects such as molecules. Each point group can be represented as sets of orthogonal matrices M that transform point x into point y according to y = Mx. Each element of a point group is either a rotation (determinant of M = 1), or it is a reflection or improper ...
Current status. Defunct as of December 26, 2014. The Yahoo! Directory was a web directory which at one time rivaled DMOZ in size. The directory was Yahoo! 's first offering and started in 1994 under the name Jerry and David's Guide to the World Wide Web. [1] When Yahoo! changed its main results to crawler-based listings under Yahoo!
Educational stages are subdivisions of formal learning, typically covering early childhood education, primary education, secondary education and tertiary education.The United Nations Educational, Scientific and Cultural Organization recognizes nine levels of education in its International Standard Classification of Education (ISCED) system (from Level 0 (pre-primary education) through Level 8 ...