建立麦克斯韦方程组的其他途径

Ways to Build Maxwell Equations

从能量守恒、电荷守恒定律或拉氏函数的规范不变性、变分原理等途径建立麦克斯韦方程组，加深了对麦克斯韦方程组反映电磁现象普通规律的认识，同时说明了麦克斯韦方程组与其他一些普通规律的等价性．

Maxwell equations is built by energy constant law, charge constant law or gauge invarianess of Lagrange function, variation principle ect. The people's understanding is deepen for that Maxwell equations reflects universal rulers of electromagnetic phenomenon, and the equivalent of Maxwell equations and other univeral rulers were explained.