Теория групп [3] Подгруппы. Абелевы и неабелевы группы. Спонтанное нарушение симметрии // LightCone
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![jingle bells (atomic heart version) [HQ]](https://sun9-50.userapi.com/K9xxk_CEJCveHiFFAYMQnRHo7EZywsVCqVVQxA/pkuvHVaYB9U.jpg)
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