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Dec 29, 2015 at 2:00 comment added M. Farrokhi D. G. In the second paper, lower and upper bounds are given for the quantity $\mu(L)$ when $L$ is a monolithic group.
Dec 29, 2015 at 1:59 comment added M. Farrokhi D. G. For solvable groups $m(G)$ (the notation used in these and other papers for $D(G)$) is simply the number of non-Frattini factors in a chief series of $G$. For an arbitrary group $m(G)=\sum_A\mu(L_G(A))$, where $A$ ranges over non-Frattini factors in a chief series of $G$. Here $L_G(A)$ is the monolithic primitive group associated with $A$ defined as $L_G(A)=A\rtimes G/C_G(A)$ if $A$ is abelian and $L_G(A)=G/C_G(A)$ if $A$ is non-abelian. Also, for a monolithic group $L$ with the socle $N$, $\mu(L)$ is defined as $\mu(L):=m(L)-m(L/N)$.
Dec 28, 2015 at 8:39 comment added Geoff Robinson These don't seem to be available of Open Access, and the abstracts don't seem to describe the results in detail. Is the outcome an algorithm for determining $D(G)$, or is there an explicit general formula?
Dec 24, 2015 at 2:11 vote accept Yiftach Barnea
Dec 24, 2015 at 0:56 history answered M. Farrokhi D. G. CC BY-SA 3.0