Reference: 一份不太简短的 LATEX 2ε 介绍
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多行公式如何左对齐？
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$$ \begin{align*} & i_t = \sigma (W_{xi}x_t + W_{hi}h_{t-1} + W_{ci}c_{t-1} +b_i)\\ & f_t = \sigma (W_{xf}x_t + W_{hf}h_{t-1} + W_{cf}c_{t-1} +b_f)\\ & \bar{c_t} = tanh(W_{xc}x_t + W_{hc}h_{t-1} + b_c)\\ & c_t = f_t \circ c_{t-1} + i_t \circ \bar{c_t}\\ & o_t = \sigma ( W_{xo}x_t + W_{ho}h_{t-1} + W_{co}c_{t} +b_o )\\ & h_t = o_t \circ tanh(c_t) \end{align*} $$
