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H.J. Locke
HJ may refer to: Science, technology, and mathematics * Hall–Janko group, a mathematical group * U.S. code for a cryptographic key change; see cryptoperiod Other uses * List of Latin-script digraphs#H, , a two-letter combination used in some languages ** hj-reduction, /hj/, a pronunciation cluster, sometimes reduced * Holden HJ, an Australian car 1974-1976 * Hajji (Hj.), an Islamic honorific * ''hic jacet'' ('here lies'), List of Latin phrases (H), Latin phrase on gravestones * Hilal-i-Jurat, post-nominal for Pakistan honour * Hitler-Jugend (Hitler Youth) * Tasman Cargo Airlines, IATA airline designator * Handjob {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hall–Janko Group
In the area of modern algebra known as group theory, the Janko group ''J2'' or the Hall-Janko group ''HJ'' is a sporadic simple group of order : 2733527 = 604800 : ≈ 6. History and properties ''J2'' is one of the 26 Sporadic groups and is also called Hall–Janko–Wales group. In 1969 Zvonimir Janko predicted J2 as one of two new simple groups having 21+4:A5 as a centralizer of an involution (the other is the Janko group J3). It was constructed by as a rank 3 permutation group on 100 points. Both the Schur multiplier and the outer automorphism group have order 2. As a permutation group on 100 points J2 has involutions moving all 100 points and involutions moving just 80 points. The former involutions are products of 25 double transportions, an odd number, and hence lift to 4-elements in the double cover 2.A100. The double cover 2.J2 occurs as a subgroup of the Conway group Co0. J2 is the only one of the 4 Janko groups that is a subquotient of the m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |