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RingTheory4.8Definition:Aring\(R\)isasettogetherwithtwobinaryoperationtogetherwith"\(+\)"and"\(\times\)",obeying:\((R,+)\)isanAbeliangroup.\(\times\)isassociative:\((a\timesb)\timesc=a\ti
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持续更新。\(\newcommand{\a}{\alpha}\newcommand{\b}{\beta}\newcommand{\D}{\Delta}\newcommand{\eps}{\varepsilon}\newcommand{\ph}{\varphi}\newcommand{\t}{\theta}\newcommand{\la}{\lambda}\newcommand{\si}{\sigma}\newcommand{\d}{
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持续更新。\(\newcommand{\a}{\alpha}\newcommand{\b}{\beta}\newcommand{\D}{\Delta}\newcommand{\eps}{\varepsilon}\newcommand{\ph}{\varphi}\newcommand{\t}{\theta}\newcommand{\la}{\lambda}\newcommand{\si}{\sigma}\newcommand{\d}{