Using the convergence domain of the matrix Ar
, the new sequence spaces a
r
c
including
the space c has been constructed in [1] and its some properties has been
investigated. Using the definition of the sequence space a
r
c
some inclusion theorems
which like to Knoop’ s Core Theorem were proved in [4] and [5].
Let A = (ank) be a lower triangular matrix defined by ank = anbk, where an
depends only on n and bk only on k, 0 ≤ k ≤ n. Recently, as a generalization of
the sequence space a
r
c
, the sequence space cA has been defined by