结果推广了同胚映射、同伦等价和同伦正则态射的有关结果。

Results Generalizing some results of homeomorphic morphism, homotopy equivalence and homotopy regular morphism.

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在差分集中引入了特殊态射，证明了由特殊态射定义的等价类所作成的商还是差分集。

In this paper we introduce special morphisms on difference sets and we prove that the quotient of the equivalence classes defined by special morphisms is a difference set.

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