We consider a nonoscillatory second-order linear dynamic equation on a time scale together with a linear perturbation of this equation and give conditions on the perturbation that guarantee that the perturbed equation is also nonoscillatory and has solutions that behave asymptotically like a recessive and dominant solutions of the unperturbed equation. As the theory of time scales unifies conti...

In this paper, some criteria for the oscillation of the high order partial difference equations of the form T i(xm,n+axm−k1,n−l1−bxm+k2,n+l2) = c(qxm−σ1,n−τ1+pxm+σ2,n+τ2) are established, where c = ±1, i ∈ N = {1, 2, 3, . . .}.

where Δ is the forward difference operator Δxn = xn+1 − xn, Δxn = Δ(Δxn), φp(s) is p-Laplacian operator φp(s) = |s|p−2s (1 < p < ∞), and f : Z×R3 → R is a continuous functional in the second, the third, and fourth variables and satisfies f (t +m,u,v,w) = f (t,u,v,w) for a given positive integerm. We may think of (1.1) as being a discrete analogue of the second-order functional differential equa...

It is shown how to define difference equations on particular lattices {xn}, n ∈ Z, made of values of an elliptic function at a sequence of arguments in arithmetic progression (elliptic lattice). Solutions to special difference equations have remarkable simple interpolatory expansions. Only linear difference equations of first order are considered here.

We show on the example of the discrete heat equation that for any given discrete derivative we can construct a nontrivial Leibniz rule suitable to find the symmetries of discrete equations. In this way we obtain a symmetry Lie algebra, defined in terms of shift operators, isomorphic to that of the continuous heat equation.

In this paper a sufficient condition is obtained for the global asmptotic stability of the following system of difference equations zn+1 = tn + zn−1 tnzn−1 + a , tn+1 = zn + tn−1 zntn−1 + a , n = 0, 1, 2, ... where the parameter a (0,∞) and the initial values (zk, tk) (0,∞) (for k = −1, 0).

We investigate multiple Charlier polynomials and in particular we will use the (nearest neighbor) recurrence relation to find the asymptotic behavior of the ratio of two multiple Charlier polynomials. This result is then used to obtain the asymptotic distribution of the zeros, which is uniform on an interval. We also deal with the case where one of the parameters of the various Poisson distribu...

In this paper we consider the oscillation of the delay difference equation with oscillating coefficients x,,+l x. + 2p,(n):z’._k.. 0, n 0. Some comparison and oscillation results are obtained.