semigroup property
71Rng (algebra) — In abstract algebra, a rng (also called a pseudo ring or non unital ring) is an algebraic structure satisfying the same properties as a ring, except that multiplication need not have an identity element. The term rng (pronounced rung ) is meant… …
72Composition of relations — In mathematics, the composition of binary relations is a concept of forming a new relation S ∘ R from two given relations R and S, having as its most well known special case the composition of functions. Contents 1 Definition 2 Properties 3 J …
73Pseudo-ring — In abstract algebra, a rng (also called a pseudo ring or non unital ring) is an algebraic structure satisfying the same properties as a ring, except that multiplication need not have an identity element. The term rng (pronounced rung) is meant to …
