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The rotation group SO(3) has as a universal cover the group SU(2), which is isomorphic to the group of versors in the quaternions. This is a double cover since the kernel has order 2. (cf the tangloids.) The unitary group U(n) is covered by the compact group T × SU(n) with the covering homomorphism given by p(z, A) = zA. The universal cover is ...
The social identity approach suggests a more general approach to group decision-making than the popular groupthink model, which is a narrow look at situations where group and other decision-making is flawed.
Di Bawah Lindungan Ka'bah (Under the Protection of Ka'bah) is the 1938 debut novel of the Indonesian author Haji Abdul Malik Karim Amrullah (1908–1981). Written while the author worked in Medan as the editor of an Islamic weekly magazine, the novel follows the doomed romance of a young Minang couple from different social backgrounds.