Mitchell, Josephine A summability theorem for double orthogonal series whose coefficients satisfy certain conditions. (English) Zbl 0033.11203 Am. J. Math. 71, 257-268 (1949). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document Keywords:Approximation and series expansion PDFBibTeX XMLCite \textit{J. Mitchell}, Am. J. Math. 71, 257--268 (1949; Zbl 0033.11203) Full Text: DOI