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safe2240534 artist:efk-san193 fluttershy266118 a little birdie told me254 equestria girls264786 g42102347 my little pony equestria girls: better together40646 3d127798 blender15970 chalkboard3770 clothes664723 eraser306 fancy mathematics264 female1878757 fluttermath8 geode of fauna2489 high res411560 lidded eyes52174 looking at you276169 magical geodes11987 make my day9 math998 scene interpretation11230 solo1482894

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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.