University of Guilan Journal of Algebra and Related Topics 2345-3931 5 2 2017 12 01 $G$-Weights and $p$-Local Rank 1 12 2711 10.22124/jart.2017.2711 EN P. Manuel Dominguez Wade Department of Mathematics, Matanzas University, Matanzas, Cuba Journal Article 2017 06 10 Let $k$ be field of characteristic $p$, and<br />let $G$ be any finite group with splitting field $k$. Assume that $B$ is a $p$-block of $G$.<br />In this paper, we introduce the notion of radical $B$-chain $C_{B}$, and we show that the $p$-local rank of $B$ is equals the length of $C_{B}$. Moreover, we prove that the vertex of a simple $kG$-module $S$ is radical if and only if it has the same vertex of the unique direct summand, up to isomorphism, of the Sylow permutation<br />module whose radical quotient is isomorphic to $S$. Finally, we prove the vertices of certain direct summands of the Sylow permutation module are bounds for the vertices of simple $kG$-modules. https://jart.guilan.ac.ir/article_2711_8f0e0342d1bad2b4ab66eb7767948d0e.pdf