Two new hereditary classes of P5-free graphs where the stability number can be found in polynomial time are proposed. They generalize several known results.
By using the continuation theorem of coincidence theory,the existence of a positive periodic solution for a two-patches competition system with diffusion and ti
A labeled graph is an ordered pair (G,L) consisting of a graph G and its labeling L:V(G)→{1,2,...,n},where n=|V(G)|.An increasing nonconsecutive path in a labe
In this paper attempts are made at answering the problems on the statistical properties of activity flow time in PERT raised by the late famous mathematician Hu
The nonlinear differential equation x′(t)=-δ(t)x(t)+f(t,x(t))(*) is considered,where δ(t) is a periodic function of periodic T,f(t,x) is continuous and perio