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1. Einsteins original theory of relativity, no need for explanation, just his original words thank you! _Baidu Knowledge According to the compilation of "Einsteins Collected Works" by Fan Dainian, Zhao Zhongli, and Xu Liangying, as we all know, when Maxwells electrodynamics - as is now commonly understood - is applied to moving objects, it causes some asymmetry, which does not seem to be inherent to the phenomenon. For example, imagine the electromagnetic interaction between a magnet and a conductor. Here, the observable phenomena are only related to the relative motion between the conductor and the magnet, but according to the usual view, whether this or that object is in motion is two completely different things. If the magnet is in motion and the conductor is stationary, an electric field with a certain amount of energy will appear near the magnet, generating a current at the location of each part of the conductor. But if the magnet is stationary and the conductor is in motion, there is no electric field near the magnet, but there is an electromotive force in the conductor. Although this electromotive force itself is not equivalent to energy, it - assuming that the relative motion in the two cases considered here is equal - will cause current, and the magnitude and route of this current are the same as those generated by electricity in the previous case. Examples like this, as well as the failure of experiments attempting to prove the motion of the Earth relative to "optical coal", have led to a conjecture that the concept of absolute stillness does not conform to the characteristics of phenomena not only in mechanics but also in electrodynamics. Instead, it should be assumed that all coordinate systems that apply to mechanical equations also apply to the laws of electrodynamics and optics mentioned above. For first-order trace quantities, this has already been proven. We need to elevate this conjecture (which will be referred to as the "principle of relativity" in the future) to a postulate and introduce another seemingly incompatible postulate: light always propagates at a certain velocity C in empty space, which is independent of the motion state of the emitter. Based on these two postulates and Maxwells theory of static bodies, it is sufficient to obtain a simple and non contradictory dynamic electrodynamics. The reference to ether of light will prove to be redundant, as according to the insights to be elucidated here, there is no need to introduce a space of absolute rest with common special properties, nor to specify a velocity vector for each point in the empty space where electromagnetic processes occur. The theory to be elucidated here, like various other electrodynamics, is based on the kinematics of rigid bodies, because any theory of this kind is about the relationship between rigid bodies (coordinate systems), clocks, and electromagnetic processes. Insufficient consideration of this situation is the root cause of the difficulties that dynamic electrodynamics must overcome at present. Section 1 of Kinematics §

1. The definition of simultaneity involves a coordinate system in which Newtonian mechanics equations are valid. In order to make our statement more rigorous and facilitate the literal distinction between this coordinate system and other coordinate systems that will be introduced in the future, we call it the "static system". If a particle is stationary relative to this coordinate system, its position rela

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