E. W. KISS, P. P. PÁLFY, A LATTICE OF NORMAL SUBGROUPS THAT IS NOT EMBEDDABLE INTO THE SUBGROUP LATTICE OF AN ABELIAN GROUP, Mathematica Scandinavica, Vol. 83, No. 2 (1998), pp. 169-176 ...
Let $A$ be a maximal abelian normal subgroup of a finite $p$-group $G(p > 2)$ such that $\lbrack G, A \rbrack$ is cyclic. Then (i) $C_G(C_G(D)) = D$ and $\lbrack G: C ...
Modern Algebra Group theory - basic properties, permutation groups, finite Abelian groups, cosets, normal subgroups, homomorphism theorems, representation. Ring theory - integral domains and fields, ...