# Definition:Operation Induced by Restriction

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## Definition

Let $\struct {S, \circ}$ be a magma.

Let $\struct {T, \circ} \subseteq \struct {S, \circ}$.

That is, let $T$ be a subset of $S$ such that $\circ$ is closed in $T$.

Then the restriction of $\circ$ to $T$, namely $\circ {\restriction_T}$, is called the **(binary) operation induced on $T$ by $\circ$**.

Note that this definition applies only if $\struct {T, \circ}$ is closed, by which virtue it is a submagma of $\struct {S, \circ}$.

## Also known as

The notation $\circ_T$ is also found for $\circ {\restriction_T}$.

## Sources

- 1965: Seth Warner:
*Modern Algebra*... (previous) ... (next): $\S 8$