In [3], we established a necessary and sufficient condition for absolute Hausdorff summability of a double orthogonal series. In this paper, we estimate the order of magnitude for Hausdorff summability of a double orthogonal series under appropriate conditions. © 2014, Akadémiai Kiadó, Budapest, Hungary.

Kalaivani K

Department of Mathematics

School of Advanced Sciences

Vellore Campus

G.P. Youvaraj

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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Journal	Analysis Mathematica
Publisher	Kluwer Academic Publishers
ISSN	01333852