Wiktionary
v-ring
n. a vaginal or intravaginal ring that releases hormones for the purpose of contraception
Wikipedia
V-ring (ring theory)
In mathematics, a V-ring is a ring R such that every simple R-module is injective. The following three conditions are equivalent:
- Every simple left (resp. right) R-module is injective
- The radical of every left (resp. right) R-module is zero
- Every left (resp. right) ideal of R is an intersection of maximal left (resp. right) ideals of R
A commutative ring is a V-ring if and only if it is Von Neumann regular.