this article presents how the mutual value reflections of all numerical systems on themselves look alike. In mathematics and its applications . A function is a special case of reflection. The definition and domain of a function are the same set, and it is easy to learn that the function is reciprocally one-valued. If the domain of definition and values of a function is a single set, which is finite, then the number of such functions and all their representations can be defined. If the number of elements of the set is n , then this set is called one-valued mappings to itself, and their number !n is equal to.

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