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A GENERALIZATION OF THE BABBAGE FUNCTIONAL EQUATION

机译:乌龟功能方程的概括

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摘要

A recent refinement of Kerekjarto's Theorem has shown that in R and R~2 all C~l -solutions of the functional equation f~n = Id are C~l-linearizable, where l ∈ {0, 1,...∞}. When l≥ 1, in the real line we prove that the same result holds for solutions of f~n = f, while we can only get a local version of it in the plane. Through examples, we show that these results are no longer true when l = 0 or when considering the functional equation f~n = f~k with n > k ≥ 2.
机译:最近的kerekjarto定理的改进表明,在r和r〜2的所有c〜l-l函数中,f〜n = id是c〜l-lixeamizable,其中l∈{0,1,...∞} 。 当L≥1时,在真实行中,我们证明了相同的结果适用于f〜n = f的解决方案,而我们只能在平面中获取本地版本。 通过示例,我们表明,当L = 0或考虑具有n>k≥2的功能方程f〜n = f〜k时,这些结果不再是真的。

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