Geodesic
Around a~conjecture of P.~Hall
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 6 (2009), pp. 366-380.

Voir la notice de l'article provenant de la source Math-Net.Ru

In the paper, we discuss perspectives of future investigations of the Hall $\pi$-properties $E_\pi$, $C_\pi$ and $D_\pi$ in finite groups. A series of open problems is stated, both comparatirely new and well-known ones. It is proven that there are infinitely many infinite sets $\pi$ of primes with $E_\pi\Rightarrow D_\pi$. Precisely if $\pi$ consists of the primes $p>x$, for every real $x\ge7$ then $E_\pi\Rightarrow D_\pi$. This result continues the investigations initiated by well-known Hall's conjecture of 1956 that $E_\pi\Rightarrow D_\pi$ for every set $\pi$ of odd primes. This conjecture was disproved by F. Gross, who showed in 1984 that, for every finite set $\pi$ of odd primes with $|\pi|\ge2$, there exists a finite group $G$ such that $G\in E_\pi$ and $G\notin D_\pi$.
Keywords: prime number, $\pi$-subgroup, $\pi$-Hall subgroup, properties $E_\pi$, $C_\pi$ and $D_\pi$. 
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D. O. Revin. Around a~conjecture of P.~Hall. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 6 (2009), pp. 366-380. http://geodesic.mathdoc.fr/item/SEMR_2009_6_a18/

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