Subramanian, N. & Misra, U. K. (2011). The v-invariant χ2 sequence spaces. TWMS Journal Of Applied And Engineering Mathematics, 1(2), 173-184.
Abstract
In this paper we define v− invariatness of a double sequence space of χ and examine the v− invariatness of the double sequence space of χ. Furthermore, we give duals of double sequence space of χ.
Source
TWMS Journal Of Applied And Engineering Mathematics