Посилання:Hall operators on the set of formations of finite groups / A.P. Mekhovich, N.N. Vorob’ev, N.T. Vorob’ev // Algebra and Discrete Mathematics. — 2010. — Vol. 9, № 1. — С. 72–78. — Бібліогр.: 19 назв. — англ.
Підтримка:Research of the second author is partially supported by Belarussian Republic Foun-dation of Fundamental Researches (BRFFI, grant F08M-118)
Let π be a nonempty set of primes and let F be a saturated formation of all finite soluble π-groups. It is constructed the saturated formation consisting of all finite π-soluble groups whose F-projectors contain a Hall π-subgroup.