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12Â¥: Originally posted by Á¿ÕÅ at 2015-12-30 10:10:24
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$$ \begin{align} \begin{array}{ccc} \left[ \begin{array}{ccc} a& &\\ &\ddots&\\ &&b \end{array}\right. & \begin{array}{ccc} a& &\\ &\ddots&\\ &&b \end{array} &\overbrace{ \left.\begin{array}{ccc} a& &\\ &\ddots&\\ &&b \end{array}\right] }^{12345} \end{array} &=\color{#cc0000}{A\cdot\sum_{k=1}^\infty\left(\frac3{2k-1}-\frac3{2k}\right)}\\ &+\color{#02a100}{\begin{array}{ccc} \underbrace{\left\{\left[ \begin{array}{ccc} a& &\\ &\ddots&\\ &&b \end{array}\right.\right.}_{12345} & \begin{array}{ccc} a& &\\ &\ddots&\\ &&b \end{array} &\overbrace{ \left.\begin{array}{ccc} a& &\\ &\ddots&\\ &&b \end{array}\right] }^{12345} \end{array} }\\ \end{align}{\tag {81}} $$

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2Â¥: Originally posted by Á¿ÕÅ at 2015-12-28 15:43:32
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\[\left({\begin{array}{*{20}{c}}{{a_{11}}}&\ldots&{\overbrace{{a_{1n}}}^{}}\\\vdots&\ddots&\vdots\\{{a_{m1}}}&\cdots&{{a_{mn}}}\end{array}}\right)\]

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