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使用

$$
your formula
$$


\[
your formula
\]
来创建行间公式

使用$your formula$来创建行内公式

行间公式:

\[ \operatorname{ker} f=\{g\in G:f(g)=e_{H}\}{\mbox{.}} \]
\[ a^2+b^2=c^2 \]

行内公式:

The homomorphism \(f\) is injective if and only if its kernel is only the singleton set \(e_G\), because otherwise \(\exists a,b\in G\) with \(a\neq b\) such that \(f(a)=f(b)\).