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Journal of Inequalities and Applications 
Volume 2006 (2006), Article ID 74171, 8 pages
doi:10.1155/JIA/2006/74171

Classes of elliptic matrices

Antonio Tarsia

Dipartimento di Matematica “L. Tonelli”, Università di Pisa, Largo Bruno Pontecorvo 5, Pisa 56127, Italy

Received 12 December 2005; Revised 20 February 2006; Accepted 21 February 2006

Abstract

The equivalence between some conditions concerning elliptic matrices is shown, namely, the Cordes condition, a generalized form of Campanato's condition, and a generalized form of a condition of Buică.