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Some variations of the Hardy hierarchy
Author(s) -
Kotlarski Henryk,
Piekart Bożena
Publication year - 2005
Publication title -
mathematical logic quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.473
H-Index - 28
eISSN - 1521-3870
pISSN - 0942-5616
DOI - 10.1002/malq.200410043
Subject(s) - lemma (botany) , hierarchy , mathematics , mathematical economics , pure mathematics , economics , poaceae , market economy , biology , ecology
We study some variations of the so‐called Hardy hierarchy (up to ε 0 ) of quickly growing functions, known from the literature, and obtain analogues of Ratajczyk's approximation lemma for them. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)