Defines intersection number ι(G) as the minimal number of maximal subgroups intersecting at Φ(G), gives exact formula for nilpotent groups and values for some non-nilpotent families.
Groups as unions of prop er subgroups
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On the Intersection Numbers of Finite Groups
Defines intersection number ι(G) as the minimal number of maximal subgroups intersecting at Φ(G), gives exact formula for nilpotent groups and values for some non-nilpotent families.