更改

对于 ('''μ'''₁,Σ₁)的下一个估计：

对于 ('''μ'''₁,Σ₁)的下一个估计：

: <math>\begin{align}(\boldsymbol{\mu}_1^{(t+1)},\Sigma_1^{(t+1)})

: <math>\begin{align}(\boldsymbol{\mu}_1^{(t+1)},\Sigma_1^{(t+1)})

&= \underset{\boldsymbol{\mu}_1,\Sigma_1} \operatorname{arg\,max} Q(\theta \mid \theta^{(t)} ) \\

&= \underset{\boldsymbol{\mu}_1,\Sigma_1} {argmax} Q(\theta \mid \theta^{(t)} ) \\

&= \underset{\boldsymbol{\mu}_1,\Sigma_1} \operatorname{arg\,max} \sum_{i=1}^n T_{1,i}^{(t)} \left\{ -\tfrac{1}{2} \log |\Sigma_1| -\tfrac{1}{2}(\mathbf{x}_i-\boldsymbol{\mu}_1)^\top\Sigma_1^{-1} (\mathbf{x}_i-\boldsymbol{\mu}_1) \right\}

&= \underset{\boldsymbol{\mu}_1,\Sigma_1} {argmax} \sum_{i=1}^n T_{1,i}^{(t)} \left\{ -\tfrac{1}{2} \log |\Sigma_1| -\tfrac{1}{2}(\mathbf{x}_i-\boldsymbol{\mu}_1)^\top\Sigma_1^{-1} (\mathbf{x}_i-\boldsymbol{\mu}_1) \right\}

\end{align}.</math>

\end{align}.</math>