数式s
(1)
\begin{align} a\sim b\iff a-b\in I \end{align}
(2)
\begin{align} \{r_{1}x_{1}s_{1}+\dots +r_{n}x_{n}s_{n}\mid n\in {\mathbb {N}},r_{i}\in R,s_{i}\in R,x_{i}\in X\} \end{align}
(3)
\begin{align} k {\begin{matrix}{\bar {k}}\\|\\K\\|\\MN\\\diagup \quad \diagdown \\M\qquad \quad N\\\diagdown \quad \diagup \\M\cap N\\|\\k\end{matrix}} \end{align}
(4)
\begin{align} k(a_{1},\ldots ,a_{n})=\left\{\left.{\frac {f(a_{1},\ldots ,a_{n})}{g(a_{1},\ldots ,a_{n})}}\ \right|f,g\in k[x_{1},\ldots ,x_{n}]\right\} \end{align}
(5)
\begin{align} k {\begin{matrix}K\\|\\k(E)\\|\\k[E]\\|\\k\end{matrix}} \end{align}
(6)
\begin{align} k[a_{1},\ldots ,a_{n}]:=\{f(a_{1},\ldots ,a_{n})\mid f\in k[x_{1},\ldots ,x_{n}]\} \end{align}
(7)
\begin{align} l {\begin{matrix}\qquad f\colon &K&\to &L\\&|&&|\\g=f|_{{k}}\colon &k&\to &l\end{matrix}} \end{align}

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  1. portal:6611312 ( 04 Jul 2020 01:21 )
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