endomorphism

《代数学引论》 · 第 171 页

因此，$A$ 叫做自同态。

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《Lecture Notes on Bayesian Estimation and Classification》 · 第 17 页 · Section 1.4「Homomorphisms and Quotient Groups」

A homomorphism $\alpha:G\to G$ is called an endomorphism of $G$. The identity function $1:G\to G$ is clearly an endomorphism.