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safe2197038 artist:efk-san191 fluttershy261098 a little birdie told me253 equestria girls258603 g42052909 my little pony equestria girls: better together40267 3d124732 blender15104 chalkboard3677 clothes644425 eraser290 fancy mathematics264 female1828324 fluttermath8 geode of fauna2464 high res409186 lidded eyes49333 looking at you264592 magical geodes11706 make my day9 math980 scene interpretation11016 solo1444783

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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.