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Oscillation of forced neutral differential equations with positive and negative coefficients 总被引:1,自引:0,他引:1
zkan
calan 《Computers & Mathematics with Applications》2007,54(11-12):1411-1421
Some sufficient conditions are obtained for the oscillation of forced neutral differential equations with positive and negative coefficients where . 相似文献
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Consider the infinite system S of word equations For each , let Tk be the subsystem of S given by i{k,k+1,k+2}. We prove two properties of the above system.
- (1) Let k≥1. If φ is a solution of Tk such that primitive roots of are of equal length, as well as primitive roots of , then φ is a solution of the whole S.
- (2) If n=1 then, for any k≥2, a solution φ of Tk is also a solution of S.
Keywords: Combinatorics on words; Equivalent subsystems; Pumping property 相似文献
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M. Jaberi Douraki Mehdi Dehghan Javad Mashreghi 《Computers & Mathematics with Applications》2008,56(1):186-198
We study the invariant interval, the character of semicycles, the global stability, and the boundedness of the difference equation where the initial conditions x−k,…,x−1,x0 are nonnegative, and p,q>0. 相似文献
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Usually polyominoes are represented as subsets of the lattice . In this paper we study a representation of polyominoes by Gaussian integers. Polyomino is represented by the set Then we consider functions of type from the set of all polyominoes to an abelian group G, given by , where v is prime in (N(v) is the norm of v). Using the arithmetic of the ring we find necessary and sufficient conditions for such a function to be a coloring map. 相似文献
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By constructing a special cone and using cone compression and expansion fixed point theorem, the existence and uniqueness are established for the following singular fourth-order boundary value problems: where f(t,x,y) may be singular at t=0,1; x=0 and y=0. 相似文献
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In this paper, we consider the (k+1)-order rational difference equation
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Stationary distribution of stochastic population systems 总被引:2,自引:0,他引:2
Xuerong Mao 《Systems & Control Letters》2011,60(6):398-405
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Existence results for boundary value problems of nonlinear fractional differential equations 总被引:1,自引:0,他引:1
Guoqing Chai 《Computers & Mathematics with Applications》2011,62(5):2374-2382
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