The concepts of $k$-closure, $k$-boundary and weak $k$-ideals are introduced and necessary and sufficient conditions that an ideal be a $k$-ideal are given. These ...
Proceedings of the American Mathematical Society, Vol. 112, No. 4 (Aug., 1991), pp. 915-918 (4 pages) Suppose A is a local ring and R = A[ X, X-1 ] is a Laurent ...
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