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Let A and B be the linear methods of the summability of double series with fields of bounded summability MA
b
'
and B
b
'
, respectively. Let T be certain set of double series. The condition x T is called B
b-Tauberian for A if A
b
'
B
b
'
.Some theorems about summability factors enable one to find new B
b-Tauberian conditions for A from the already known B
b-Tauberian conditions for A. 相似文献
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