This paper gives a constructive proof of existence of period of polynomials infinite field. Using it we can also find the period of polynomials.
本文给出有限域上多项式周期存在的构造性证明，利用它可求出多项式的周期。
A sufficient condition that the complementarity problem has solution is given in this paper, the proof of existence is constructive.
本文给出互补问题解的存在性的一个充分条件，其证明是构造性的。
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