Abstract
An n -ary operation (n ∈ ℕ0) on a set A is a map ω: A n → A, where A 0 := { ∅ }. The number n is called the arity of ω. A universal algebra is a pair 𝒜 = (A, Ω) consisting of a non-empty set A and a set Ω of operations on A. The set A and the members of Ω are called the universe and the fundamental operations of the algebra 𝒜, respectively. In practice, one usually is not interested in a single, isolated algebra but in a class of algebras of the same type. Therefore it is more customary to consider the set Ω not as the set of operations on the given set A but rather as the set of operation symbols. Formally this is achieved by first introducing the notion of type. The type is a set Ω together with a partition Ω = Ω0 ∪ Ω1 ∪ Ω2⋯. (Empty Ωi are allowed.) Alternatively, the type is a set Ω together with a mapping r: Ω → ℕ0. A universal algebra of type Ω, or simply an Ω-algebra is a pair 𝒜 = (A, Ω) where A is a non-empty set and to every ω ∈ Ωn it is assigned an n-ary operation on A, denoted by the same symbol ω. Cf. Section G.10 for a generalization of these concepts.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 2002 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Artamonov, V.A. et al. (2002). Universal Algebra. In: The Concise Handbook of Algebra. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-3267-3_7
Download citation
DOI: https://doi.org/10.1007/978-94-017-3267-3_7
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-017-3269-7
Online ISBN: 978-94-017-3267-3
eBook Packages: Springer Book Archive