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\begin{equation}
\begin{pmatrix}
M&m_1&m_2&0 \\
0&m_{1}&-m_2&0 \\
2&-1&-1&0
\end{pmatrix}
\begin{pmatrix}
A \\ a\\ b\\ T
\end{pmatrix}
=
\begin{pmatrix}
F-Mg-(m_1+m_2)g \\ (m_2-m_{1})g \\ 0
\end{pmatrix}
\end{equation}
\begin{equation}
H_c=\frac{1}{2n} \sum^n_{l=0}(-1)^{l}(n-l)^{p-2}
\end{equation}
\begin{equation}
\left.\begin{aligned}
B’&=-\partial\times E, \\
E’&=\partial \times B – 4\pi j,
\end{aligned}
\right\}
\qquad \text{Maxwell’s equations}
\end{equation}