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Buchholz, Wilfried and Cichon, A. and Weiermann, A. (1994): A uniform approach to fundamental sequences and hierarchies. In: Mathematical Logic Quarterly, No. 40: pp. 273-286
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Abstract

In this article we give a unifying approach to the theory of fundamental sequences and their related Hardy hierarchies of number-theoretic functions and we show the equivalence of the new approach with the classical one.