# Definition:Algebraic Structure/Two Operations

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## Definition

An **algebraic structure with $2$ operations** is an ordered triple:

- $\struct {S, \circ, *}$

where:

- $S$ is a set
- $\circ$ and $*$ are binary operations defined on all the elements of $S \times S$.

## Also known as

Some sources refer to an **algebraic structure** as an **abstract algebra**, but this term is more generally used for the branch of mathematics that studies **these structures**.

Some sources use the term **algebraic system**, which $\mathsf{Pr} \infty \mathsf{fWiki}$ reserves for a slightly more general concept.

Some sources use the variant term **algebraic structure with $n$ compositions**.

Some sources use the notation $\gen {S, \circ_1, \circ_2, \ldots}$ for $\struct {S, \circ_1, \circ_2, \ldots}$ and so on.

## Also see

- Definition:Closed Algebraic Structure
- Definition:Magma
- Definition:Algebraic System, a slightly more general concept

- Definition:Underlying Set of Structure: the set $S$ on $\struct {S, \circ, *}$

- Results about
**algebraic structures**can be found here.

## Sources

- 1965: Seth Warner:
*Modern Algebra*... (previous) ... (next): Chapter $\text I$: Algebraic Structures: $\S 6$: Isomorphisms of Algebraic Structures