Lecture Notes on Bayesian Estimation and Classification
《Lecture Notes on Bayesian Estimation and Classification》 · 第 223 页 · Section 8.2「Structure of the Group Algebra」，Definition
If $R$ and $S$ are rings, an anti-homomorphism from $R$ to $S$ is a homomorphism $\alpha:R\to S$ of additive groups such that $(r_1r_2)\alpha=(r_2\alpha)(r_1\alpha)$, $(r_i\in R)$. An anti-homomorphism which is bijective is called an anti-isomorphism.