Mercerian theorem for four dimensional matrices

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20. M. Ye¸silkayagil, F. Ba¸sar, Domain of Riesz mean in some spaces of double sequences, under communication. Current address: Department of Mathematics, Fatih University, The Hadımköy Campus, Büyükçekmece, 34500 ·Istanbul, Turkey
21. E-mail address: [email protected] & [email protected] Current address: Medine Ye¸silkayagil: Department of Mathematics, U¸sak University, 1 Eylül Campus, 64200 U¸sak, Turkey
22. E-mail address: [email protected]
23. A. Wilansky, Summability through Functional Analysis, North-Holland Mathematics Studies, Amsterdam New York Oxford, 1984.
24. M. Ye¸silkayagil, F. Ba¸sar, Domain of Riesz mean in some spaces of double sequences, under communication. Current address: Department of Mathematics, Fatih University, The Hadımköy Campus, Büyükçekmece, 34500 ·Istanbul, Turkey
25. E-mail address: [email protected] & [email protected] Current address: Medine Ye¸silkayagil: Department of Mathematics, U¸sak University, 1 Eylül Campus, 64200 U¸sak, Turkey
26. E-mail address: [email protected]