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Let $G$ be a finite group and $V_i$, $i=1,...,r$ be the irreducible representations, $d_i:=dim(V_i)$$d_i:=\dim(V_i)$. Then $|G|=\sum_i d_{i}^{2}$.
Let $G$ be a finite group and $V_i$, $i=1,...,r$ be the irreducible representations, $d_i:=dim(V_i)$. Then $|G|=\sum_i d_{i}^{2}$.
Let $G$ be a finite group and $V_i$, $i=1,...,r$ be the irreducible representations, $d_i:=\dim(V_i)$. Then $|G|=\sum_i d_{i}^{2}$.
