In this paper, we investigate necessary conditions for some typical single-input single-output fuzzy systems as universal approximators for continuous functions defined on compact domains with arbitrarily small uniform approximation error bounds. The necessary conditions we found provide a basis for insightful analysis of strength as well as limitation of the fuzzy systems. The main strength is that only a small number of fuzzy rules may be needed to uniformly approximate continuous functions that have a complicated formulation but a relatively small number of extrema. The limitation is that in order to approximate frequently oscillatory continuous functions, the number of fuzzy rules must be large.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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