Definition:Operation Induced by Injection

Definition

Let $\struct {T, \circ}$ be an algebraic structure.

Let $f: S \to T$ be an injection.

Then the operation induced on $S$ by $f$ and $\circ$ is the binary operation $\circ_f$ on $S$ defined by:

$\circ_f: S \times S \to S: x \circ_f y := \map {f^{-1} } {\map f x \circ \map f y}$

Also known as

This is an instance of the more general phenomenon of a structure being pulled back along a function.

Also see

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• Definition:Pullback of Quotient Group Isomorphism

Thus $\circ_f$ may be called the pullback of $\circ$ along $f$; it may be denoted by $f^* \circ$.

This article needs to be linked to other articles. In particular: pullback; may not exist Is the above link it? It looks totally different but there may be an isomorphism there if only for looking. You can help $\mathsf{Pr} \infty \mathsf{fWiki}$ by adding these links. To discuss this page in more detail, feel free to use the talk page. When this work has been completed, you may remove this instance of {{MissingLinks}} from the code.