Abstract
We give new equivalent characterizations for ideals of Borel type. Also, we prove that the regularity of a product of ideals of Borel type is bounded by the sum of the regularities of those ideals.
2000 Mathematics Subject Classification:
ACKNOWLEDGMENT
This paper was supported by the CNCSIS grant ID-PCE no. 51/2007.
Notes
Communicated by I. Swanson.