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MathML

\begin{aligned} \hat{L M} & = \frac{1}{T^{2}} \sum_{t = 1}^{T} \frac{S_{t}^{2}}{s^{2} (l)} \\ s^{2} (l) & = \frac{1}{T} \sum_{t = 1}^{T} {\hat{u}}_{t}^{2} + \frac{2}{T} \sum_{s = 1}^{l} w (s, l) \sum_{t = s + 1}^{T} {\hat{u}}_{t} {\hat{u}}_{t - s} \\ S_{t} & = \sum_{τ = 1}^{t} {\hat{u}}_{τ} \end{aligned}

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Math as LaTeX Source

\begin{align*} \widehat{\mi{LM}}& =\frac{1}{T^2}\sum _{t=1}^ T\frac{S_ t^2}{s^2(l)}\\ s^2(l)& =\frac{1}{T}\sum _{t=1}^ T \hat{u}^2_ t+\frac{2}{T}\sum _{s=1}^ lw(s,l)\sum _{t=s+1}^ T\hat{u}_ t\hat{u}_{t-s}\\ S_ t& =\sum _{\tau =1}^ t \hat{u}_\tau \end{align*}