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latex公式編輯

$$ \begin{eqnarray*} \vec{x}\stackrel{\mathrm{def}}{=}{x_1, \dots, x_n}\\ {n+1 \choose k}={n \choose k} + {n \choose k-1}\\ \sum_{k_0,k_1,\ldots>0 \atop k_0+k_1+\cdots=n}A_{k_0}A_{k_1}\cdots \end{eqnarray*}, \;\;\;\; \vec{1}, \stackrel{\mathrm{def}}{=}{x_1, \dots, x_n}, {n+1 \choose k} = {n \choose k}
+{n \choose k-1}, \sum\limits_{k_0, k_1,\ldots>0 \atop k_0 +k_1 + \cdots = n}A_{k_0}A_{k_1} $$