TY - JOUR
ID - 75276
TI - Tenacious Graph is NP-hard
JO - Journal of Algorithms and Computation
JA - JAC
LA - en
SN - 2476-2776
AU - Moazzami, Dara
AD - Department of Algorithms and Computation, Faculty of Engineering Science, College of Engineering, University of Tehran, Iran,
Y1 - 2019
PY - 2019
VL - 51
IS - 2
SP - 127
EP - 134
KW - minimum degree
KW - Complexity
KW - Tenacity
KW - $NP$-hard
KW - $T$-tenacious
DO -
N2 - The tenacity of a graph $G$, $T(G)$, is defined by$T(G) = min{frac{mid Smid +tau(G-S)}{omega(G-S)}}$, where theminimum is taken over all vertex cutsets $S$ of $G$. We define$tau(G - S)$ to be the number of the vertices in the largestcomponent of the graph $G-S$, and $omega(G-S)$ be the number ofcomponents of $G-S$. In this paperwe consider the relationship between the minimum degree $delta (G)$ of a graph and the complexityof recognizing if a graph is $T$-tenacious. Let $Tgeq 1$ be a rational number. We first show that if$delta(G)geq frac{Tn}{T+1}$, then $G$ is $T$-tenacious. On the other hand, for any fixed $epsilon>0$, weshow that it is $NP$-hard to determine if $G$ is $T$-tenacious, even for the class of graphs with $delta(G)geq(frac{T}{T+1}-epsilon )n$.
UR - https://jac.ut.ac.ir/article_75276.html
L1 - https://jac.ut.ac.ir/article_75276_859179202bd0083eec05d9bf12027118.pdf
ER -