Page:Grundgleichungen (Minkowski).djvu/6

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i.e. the components of the convection current , and the electric density multiplied by .

Further I shall write



i.e., the components of and along the three axes; now if we take any two indices h, k out of the series





Then the three equations comprised in (I), and the equation (II) multiplied by i becomes


On the other hand, the three equations comprised in (III) multiplied by -i, and equation (IV) multiplied by -1, become


By means of this method of writing we at once notice the perfect symmetry of the 1st as well as the 2nd system of equations