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
In this paper the sufficient conditions for the existence of positive solutions of the neutral difference equations with positive and negative coefficients are
Let G be a k-connected simple graph with order n. The k-diameter, combining connectivity with diameter, of G is the minimum integer dk(G) for which between any
The singularly perturbed initial boundary value problems for reaction diffusion equations are considered. Under suitable conditions and by using the theory of d
Based on the combination of fractional calculus with fractal functions, a new type of is introduced; the definition, graph, property and dimension of this functi