This question already has an answer here:
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I read in a physics today paper,
The electron can have nonvanishing EDM only if nature violates symmetry under time reversal (T) and under the combined operations of charge conjugation (C), which replaces particle by antiparticle (as we all know), and parity inversion (P).
I checked here. So it will be nice if you can show me qualitatively and quantitatively about the above mentioned point.
Note: Simplicity in explanation is always nice. (I don't have much idea of these big words)