Media type: E-Article Title: Order equalities for some functionals and their application to the estimation of the best n-term approximations and widths Contributor: Shydlich, A. L. Published: Springer Science and Business Media LLC, 2009 Published in: Ukrainian Mathematical Journal, 61 (2009) 10, Seite 1649-1671 Language: English DOI: 10.1007/s11253-010-0304-z ISSN: 0041-5995; 1573-9376 Keywords: General Mathematics Origination: Footnote: