Pseudo-ring
From Wikipedia, the free encyclopedia
In mathematics, and more specifically in abstract algebra, a pseudo-ring is one of the following variants of a ring:
- A rng, i.e., a structure satisfying all the axioms of a ring except for the existence of a multiplicative identity.[1]
- A set R with two binary operations + and ⋅ such that (R, +) is an abelian group with identity 0, and a(b + c) + a0 = ab + ac and (b + c)a + 0a = ba + ca for all a, b, c in R.[2]
- An abelian group (A, +) equipped with a subgroup B and a multiplication B × A → A making B a ring and A a B-module.[3]
None of these definitions are equivalent, so it is best[editorializing] to avoid the term "pseudo-ring" or to clarify which meaning is intended.
See also
- Semiring – an algebraic structure similar to a ring, but without the requirement that each element must have an additive inverse
