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safe2256954 artist:efk-san194 fluttershy267996 a little birdie told me254 equestria girls266635 g42117572 my little pony equestria girls: better together40782 3d129220 blender16244 chalkboard3788 clothes672869 eraser308 fancy mathematics264 female1897085 fluttermath8 geode of fauna2520 high res412381 lidded eyes52985 looking at you280259 magical geodes12106 make my day9 math1000 scene interpretation11313 solo1497352

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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.