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使用花括号和半行移位对齐序列

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使用花括号和半行移位对齐序列

谁能告诉我如何重写这些方程式：

enter image description here

有花括号和半行移位，我不知道如何在 align( eqnarray) 环境中写入它。

答案1

我想，这已经足够接近了：

enter image description here

\documentclass{article}
\usepackage{array}% http://ctan.org/pkg/array
\newcommand{\vplus}{\begin{array}{l}\vphantom{+2=t_{1,1}}\\\vphantom{+2=t_{1,1}}\end{array}}
\begin{document}
\[
  \setlength{\arraycolsep}{0pt}
  \renewcommand{\arraystretch}{1.2}
  \begin{array}{rl}
    a_{ 1,2} & {}=  1 \\
    a_{ 2,2} & {}=  5 \\
    a_{ 3,2} & {}=  7 \\
    a_{ 4,2} & {}= 11 \\
    a_{ 5,2} & {}= 13 \\
    a_{ 6,2} & {}= 17 \\
    a_{ 7,2} & {}= 19 \\
    a_{ 8,2} & {}= 23 \\
    a_{ 9,2} & {}= 25 \\
    a_{10,2} & {}= 29 \\
    {}
  \end{array} \quad \begin{array}{r>{\hphantom{\biggr\}}}l}
    \multicolumn{2}{l}{\begin{array}{r}
      +4 \\ +2
    \end{array}\biggr\}\begin{array}{l}
      {}= t_{1,2} \\ {}= t_{2,2}
    \end{array}\smash{\biggr\}}} \\
    +4 & {}= t_{1,2} \\
    +2 & {}= t_{2,2} \\
    +4 & {}= t_{1,2} \\
    +2 & {}= t_{2,2} \\
    +4 & {}= t_{1,2} \\
    \multicolumn{2}{l}{\begin{array}{r}
      +2 \\ +4
    \end{array}\smash{\biggr\}}\begin{array}{l}
      {}= t_{2,2} \\ {}= t_{1,2}
    \end{array}\biggr\}} \\
    +2 & {}= t_{2,2}
  \end{array} \quad \begin{array}{l}
    \vplus\begin{array}{rl}
      6 & {}= t_{1,3}
    \end{array} \\
    \begin{array}{>{\phantom{6}}rl}
      & {}= t_{2,3} \\
      & {}= t_{3,3} \\
      & {}= t_{4,3} \\
      & {}= t_{5,3} \\
      & {}= t_{6,3}
    \end{array} \\
    \vplus\begin{array}{rl}
      6 & {}= t_{7,3} = t_{1,2} + t_{2,2}
    \end{array} \\
    \begin{array}{>{\phantom{6}}rl}
      & {}= t_{8,3}
    \end{array}
  \end{array}
\]
\end{document}

array这个解决方案受到围绕数学轴垂直居中这一事实的很大影响。

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