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$$ \begin{align} m_t &= \beta_1m_{t-1} + (1-\beta_1)g_t \\v_t &= \beta_2v_{t-1} + (1-\beta_2)g_t^2 \end{align} $$

Talking something then starting a LaTEX block $$ \begin{align} m_t &= \beta_1m_{t-1} + (1-\beta_1)g_t \\v_t &= \beta_2v_{t-1} + (1-\beta_2)g_t^2 \end{align} $$