MathSciNet bibliographic data MR2799825 47B37 (40C05 40H05 47A10) Akhmedov, A. M.; El-Shabrawy, S. R. On the fine spectrum of the operator \$\Delta\sb {a,b}\$$\Delta\sb {a,b}$ over the sequence space \$c\$$c$. Comput. Math. Appl. 61 (2011), no. 10, 2994–3002. Article

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