Graphs & digraphs (2nd ed.)
A note on K4-closures in Hamiltonian graph theory
Discrete Mathematics
A closure concept based on neighborhood unions of independent triples
Proceedings of the first Malta conference on Graphs and combinatorics
On a closure concept in claw-free graphs
Journal of Combinatorial Theory Series B
Closure concepts for claw-free graphs
Discrete Mathematics
Closure and Hamiltonian-connectivity of claw-free graphs
Discrete Mathematics
Closure and factor-critical graphs
Discrete Mathematics
Searching minimal fractional graph factors by lattice based evolution
WSEAS Transactions on Information Science and Applications
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A graph G is called n-factor-critical if the removal of every set of n vertices results in a graph with a 1-factor. We prove the following theorem: Let G be a graph and let x be a locally n-connected vertex. Let {u, υ} be a pair of vertices in V(G) - {x} such that uυ ∈ E(G), x ∈ NG(u) ∩ NG(υ), and NG(x) ⊂ NG(u) ∪ NG(υ) ∪ {u, υ}. Then G is n-factor-critical if and only if G + uυ is n-factor-critical.