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Twin minus domination in directed graphs | ||
| Communications in Combinatorics and Optimization | ||
| مقاله 5، دوره 1، شماره 2، اسفند 2016، صفحه 149-164 اصل مقاله (467.96 K) | ||
| نوع مقاله: Original paper | ||
| شناسه دیجیتال (DOI): 10.22049/cco.2016.13575 | ||
| نویسندگان | ||
| Maryam Atapour* 1؛ Abdollah Khodkar2 | ||
| 1Department of Mathematics Faculty of basic sciences University of Bonab Bonab, Iran, Po. Box: 5551761167 | ||
| 2Department of Mathematics University of West Georgia Carrollton, GA 30118, USA | ||
| چکیده | ||
| Let $D=(V,A)$ be a finite simple directed graph. A function $f:V\longrightarrow \{-1,0,1\}$ is called a twin minus dominating function if $f(N^-[v])\ge 1$ and $f(N^+[v])\ge 1$ for each vertex $v\in V$. The twin minus domination number of $D$ is $\gamma_{-}^*(D)=\min\{w(f)\mid f \mbox{ is a twin minus dominating function of } D\}$. In this paper, we initiate the study of twin minus domination numbers in digraphs and present some lower bounds for $\gamma_{-}^*(D)$ in terms of the order, size and maximum and minimum in-degrees and out-degrees. | ||
| کلیدواژه‌ها | ||
| twin domination in digraphs؛ minus domination in graphs؛ twin minus domination in digraphs | ||
| مراجع | ||
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