Geodesic
Maxwell equations and direction of electromagnetic field
Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 9, Tome 329 (2005), pp. 118-146 
R. Ya. Nizkii. Maxwell equations and direction of electromagnetic field. Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 9, Tome 329 (2005), pp. 118-146. http://geodesic.mathdoc.fr/item/ZNSL_2005_329_a10/
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     author = {R. Ya. Nizkii},
     title = {Maxwell equations and direction of electromagnetic field},
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     year = {2005},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2005_329_a10/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

A mapping $F\colon U\to\Lambda_2(M_0)$, $U\subset\mathbb R^4$, satisfying the Maxwell equations is regarded as the tensor of a certain electromagnetic field (EM-field) in vacuum. The EM-field is described on the basis of a special decomposition $F=e\omega+h(\ast\omega)$, where the mapping $\omega\colon U\to G^1$ is called the direction of the EM-field, and $e\colon U\to (0,+\infty)$ and $h\colon U\to\mathbb R$ are the electric and magnetic coefficients of the EM-field. The Maxwell equations are reformulated in terms of $\omega$, $e$, and $h$. EM-fields whose set of directions is a point or a one-dimensional subset of $G^1$ are considered.

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