The Riesz Core of a Sequence

 The Riesz sequence space qcr including the space c has recently been defined in [14] and its some propertieshave been investigated. In the present paper, we introduce a new type core, Kq-core, of a complex valuedsequence and also determine the required conditions for a matrix B for which Kq-core (Bx) ⊆ K-core (x), Kqcore (Bx) ⊆ stA-core (x) and Kq-core (Bx) ⊆ Kq-core (x) hold for all x ∈ ∞ A . 

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