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Champions of Equestria

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safe2256983 artist:efk-san194 fluttershy268002 a little birdie told me254 equestria girls266633 g42117614 my little pony equestria girls: better together40781 3d129222 blender16244 chalkboard3788 clothes672890 eraser308 fancy mathematics264 female1897147 fluttermath8 geode of fauna2520 high res412385 lidded eyes52988 looking at you280272 magical geodes12106 make my day9 math1000 scene interpretation11313 solo1497381

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OC1024
My Little Pony - 1992 Edition
Artist -

STUDY!
I think it is about electrodynamics mixed with some atomic physics. The charge density rho and an angular quantum number l and a matrix an,n say so.  
Am I overthinking something? I think the 4*epsilon_0*phi says otherwise.