Amadeus
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Electric field outside dielectrics
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You are right, the essential reason because you can find a nonzero parallel components of the electric field on the surface, is that you will have a polarization charge. It is given by the divergence ...

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What is the precise definition of a 4-vector?
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Don't think about the 4-vector's definition, think about how these objects are transformed. A four-vector is a simple four ranged covariant tensor, mathematically it is no more than that. The ...

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How is Einstein's postulate about the invariance of the laws of physics justified?
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For locality. The general relativity extends the special postulates with the equivalence principle which postulates that there exists an accelerated frame that "cancels" the external gravitional field ...

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