摘要：\begin{equation}\label{equ1} A = S\left( {\begin{array}{*{20}{c}} {{E_r}}&0 \\ 0&0\end{array}} \right)T\end{equation}\eqref{equ1} 阅读全文

摘要：$\emph{Ker}A$适用于winedt\[{\text{Ker}}\]适用于博客 阅读全文

摘要：$$ \left\{\begin{aligned}{\beta _1} &= {\alpha _1}\\{\beta _2} &= {\alpha _2} - \frac{{\left( {{\alpha _2},{\beta _1}} \right)}}{{\left( {{\beta _1},{... 阅读全文