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 On the structure of factor Lie algebras Bull. Korean Math. Soc. 2017 Vol. 54, No. 2, 455-461 https://doi.org/10.4134/BKMS.b160012Published online March 31, 2017 Homayoon Arabyani, Farhad Panbehkar, and Hesam Safa Neyshabur Branch, Islamic Azad University, Neyshabur Branch, Islamic Azad University, University of Bojnord Abstract : The Lie algebra analogue of Schur's result which is proved by Moneyhun in 1994, states that if $L$ is a Lie algebra such that $\mathrm{dim}L/Z(L)=n$, then $\mathrm{dim}L_{(2)}=\frac{1}{2}n(n-1)-s$ for some non-negative integer $s$. In the present paper, we determine the structure of central factor (for $s=0$) and the factor Lie algebra $L/Z_2(L)$ (for all $s\geq0$) of a finite dimensional nilpotent Lie algebra $L$, with $n$-dimensional central factor. Furthermore, by using the concept of $n$-isoclinism, we discuss an upper bound for the dimension of $L/Z_n(L)$ in terms of dim$L_{(n+1)}$, when the factor Lie algebra $L/Z_n(L)$ is finitely generated and $n\geq 1$. Keywords : factor Lie algebra, $n$-isoclinism, nilpotent Lie algebra MSC numbers : Primary 17B30, 17B60; Secondary 17B99 Downloads: Full-text PDF