Periodic solution for a delayed three-species food-chain system with Holling type-II functional response.
Stability analysis of a delayed SIR epidemic model with stage structure and nonlinear incidence.
Asymptotic properties of a hepatitis B virus infection model with time delay.
Global stability for a delayed predator-prey system with stage structure for the predator.
Stability and bifurcation of a class of discrete-time Cohen-Grossberg neural networks with delays.
Periodic solutions of a delayed predator-prey model with stage structure for predator.
Nowhere-zero 3-flows in squares of graphs.
Stability and bifurcation in a delayed predator-prey system with stage structure and functional response.
Limit cycles for a class of polynomial systems and applications.
Bipartite toughness and -factors in bipartite graphs.
More on even [a,b]-factors in graphs
In this note we give a characterization of the complete bipartite graphs which have an even (odd) [a,b]-factor. For general graphs we prove that an a-edge connected graph G with n vertices and with δ(G) ≥ max{a+1,an/(a+b) + a - 2} has an even [a,b]-factor, where a and b are even and 2 ≤ a ≤ b. With regard to the edge-connectivity this result is slightly better than one of the similar results obtained by Kouider and Vestergaard in 2004 and unlike their results, this result has no restriction on the...
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