(algebra) A ring (which is also a commutative algebra), denoted K[X], formed from the set of polynomials (usually of one variable, in a given set, X), with coefficients in a given ring (often a field), K.

Synonym of Landolt C

plural of Landolt ring

A ring (jewellery item) made up of multiple interconnected bands, capable of being taken apart and reassembled.

plural of puzzle ring

plural of vortex ring

A toroidal vortex in a fluid or gas, i.e. a region where the fluid mostly spins around an imaginary axis line that forms a closed loop.

(algebra) An integral domain D such that for every element x of its field of fractions F, at least one of x or x⁻¹ belongs to D.

plural of valuation ring

(geometry, dated) A torus.