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In this paper, a new Ritt-Wu's characteristic set method for ordinary di®erence systems is proposed, which is valid for any admissible ordering. New deˉnition for irreducible chains and new zero ...
We prove several basic properties for di®erence ascending chains including a necessary and su±cient condition for an ascending chain to be the characteristic set of its saturation ideal and a nec...
In this paper, we present an algorithm to decompose ordinary nonlinear dierence polynomials with rational functions as coe±cients. The algorithm provides an eective reduction of the decomposition of d...
In this paper the di®erence of the variance functions between two estimated responses for a fourth order design at any two points in the factor space is developed. In particular, the variance fu...

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