Let F be a class of groups and let G be a finite group. We refer to a set Sigma of subgroups of G as a G-covering subgroup system for a class F if G is an element of F whenever Sigma subset of F. Also, we provide some nontrivial G-covering subgroup system for the class F of all sigma-nilpotent groups.
机构:
Univ Porto, Fac Ciencias, Ctr Matemat, Rua Campo Alegre 687, P-4169007 Porto, Portugal
Univ Porto, Fac Ciencias, Dept Matemat, Rua Campo Alegre 687, P-4169007 Porto, PortugalUniv Porto, Fac Ciencias, Ctr Matemat, Rua Campo Alegre 687, P-4169007 Porto, Portugal
Almeida, J.
Shahzamanian, M. H.
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Univ Porto, Fac Ciencias, Ctr Matemat, Rua Campo Alegre 687, P-4169007 Porto, Portugal
Univ Porto, Fac Ciencias, Dept Matemat, Rua Campo Alegre 687, P-4169007 Porto, PortugalUniv Porto, Fac Ciencias, Ctr Matemat, Rua Campo Alegre 687, P-4169007 Porto, Portugal
Shahzamanian, M. H.
Kufleitner, M.
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Loughborough Univ, Dept Comp Sci, Epinal Way, Loughborough LE11 3TU, Leics, EnglandUniv Porto, Fac Ciencias, Ctr Matemat, Rua Campo Alegre 687, P-4169007 Porto, Portugal
机构:
Guangxi Normal Univ, Sch Math & Stat, Ctr Appl Math Guangxi, Guilin, Guangxi, Peoples R ChinaGuangxi Normal Univ, Sch Math & Stat, Ctr Appl Math Guangxi, Guilin, Guangxi, Peoples R China
Zhang, Boru
Lu, Jiakuan
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Guangxi Normal Univ, Sch Math & Stat, Ctr Appl Math Guangxi, Guilin, Guangxi, Peoples R ChinaGuangxi Normal Univ, Sch Math & Stat, Ctr Appl Math Guangxi, Guilin, Guangxi, Peoples R China
Lu, Jiakuan
Meng, Wei
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Guilin Univ Elect Technol, Sch Math & Comp Sci, Guilin, Guangxi, Peoples R China
Southern Univ Sci & Technol, SUSTech Int Ctr Math, Shenzhen, Guangdong, Peoples R ChinaGuangxi Normal Univ, Sch Math & Stat, Ctr Appl Math Guangxi, Guilin, Guangxi, Peoples R China
机构:
Univ Salerno, Dipartimento Matemat, Via Giovanni Paolo II 132, I-84084 Fisciano, SA, ItalyUniv Brasilia, Dept Matemat, BR-70910900 Brasilia, DF, Brazil