LAUSR

Abstract An extension of integral domains is called a quasi-divisor closed extension if, whenever for some nonzero then there exist units u, v of B such that The notion of a quasi-divisor closed extension is a generalization of that of a divisor closed extension. In this article, we prove some new results about divisor closed extensions and quasi-divisor closed extensions of integral domains. In particular, we study quasi-divisor closed extensions of graded domains, where the grading is over grading monoids.