University of IsfahanTransactions on Combinatorics2251-86579420201201Zero-sum flow number of categorical and strong product of graphs1811992451710.22108/toc.2020.120375.1689ENMuhammad AamerRashidDepartment of Mathematics,
COMSATS University Islamabad, Lahore Campus, 54000, PakistanSarfrazAhmadDepartment of Mathematics, COMSATS University Islamabad, Lahore Campus, 54000, PakistanMuhammad FarhanHanifDepartment of Mathematics,
COMSATS University Islamabad, Lahore Campus, 54000, PakistanMuhammad KamranSiddiquiDepartment of Mathematics COMSATS University Islamabad, Lahore Campus, 54000, PakistanMuhammadNaeemDepartment of Mathematics, The University of Okara, PakistanJournal Article20191207A zero-sum flow is an assignment of nonzero integers to the edges such that the sum of the values of all edges incident with each vertex is zero, and we call it a zero-sum $k$-flow if the absolute values of edges are less than $k$. We define the zero-sum flow number of $G$ as the least integer $k$ for which $G$ admitting a zero sum $k$-flow.?<br /> In this paper we gave complete zero-sum flow and zero sum numbers for categorical and strong product of two graphs namely cycle and paths.https://toc.ui.ac.ir/article_24517_97a6195eb2729b9bbe843c44360c7b64.pdf