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The current site grows from the registration page of the 14th annual meeting of CNEDRES and maintained by one of its members, Dr Ding-fang Zeng from Beijing University of Technology. *The two equations* in the logo of this site are the Maxwell equations expressed in the language of differential forms. They got a two-way tie with the Euler Relation $e^{i\pi}+1=0$ in the reader poll of *Physics World* magazine in 2004. The relevant definitions are as follows: $dF=\partial_{\mu} F_{\nu\sigma}dx^{\mu}\wedge dx^{\nu}\wedge dx^\sigma$,
$d*F=\partial_{\phi}(\epsilon_{\mu\nu\sigma\rho}F^{\sigma\rho})dx^{\phi}\wedge$ $dx^{\mu}\wedge$ $dx^{\nu}$,
So the equations in this site-logo is the abbreviation of tensorial equation
$\partial_{\mu}F^{\mu\nu}=j^{\nu}, \partial_{[\mu}F_{\nu\sigma]}=0$, whose component form reads

$\left\{\begin{array}{l}\nabla\cdot\mathbf{E}=\rho\\\nabla\times\mathbf{B}=\mathbf{j}+\frac{\partial\mathbf{E}}{\partial t}\end{array}\right.$, $\left\{\begin{array}{l}\nabla\times\mathbf{E}=-\frac{\partial\mathbf{B}}{\partial t}\\\nabla\cdot\mathbf{B}=0\end{array}\right.$

It can be thought that, this equation array and the property-structure of materials consist the total content of this course, "Electrodynamics". While members of our community can also be classified into two groups according to their research emphasis is more on this equation itself or more on the structure and property of materials。

All math formulas are input and displayed using javascripts "Mathjax.js"，If you cannot see effects like this picture ，Please tune your browsers according to suggestions of that scripts.
If you have question or suggestions on the contents of this site, please contact us through the email: dfzeng2000@aliyun.com

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