在一个 Align 环境中嵌入 2 个 Cases 环境

Question

问题已解决：

我想在一个 align 环境中嵌入两个 cases 环境。以下是所需的输出：

这是我的 MWE：

\documentclass[11pt,fleqn]{book} 
\usepackage{pgfplots}
\pgfplotsset{compat=1.14}
\usepackage{pgfplotstable}
\usepgfplotslibrary{polar}

\usepgflibrary{shapes.geometric}
\usetikzlibrary{calc}
\usepackage{tikz}
\usepackage{array}
% highlighting throughout the book
\usepackage{mathptmx} % Use the Adobe Times Roman as the default text font 
                      % together with math symbols from the Symbol, 
                      % Chancery and Computer Modern fonts
\usepackage{microtype} % Slightly tweak font spacing for aesthetics
\usepackage[utf8]{inputenc} % Required for including letters with accents
\usepackage[T1]{fontenc} % Use 8-bit encoding that has 256 glyphs
\usepackage{amsthm}

\usepackage{mathtools}       
\begin{document}
\begin{align*}
    \delta &
    \begin{cases}
        \sigma  = \textrm{nanu nanu} & \iota = [0 - 0.5]\\
        \beta   = \textrm{nanu nanu} & \iota = (0.5 - 0.9)\\
        \tau    = \textrm{nanu nanu} & \iota = [0.9 - 1]
    \end{cases}
    \alpha &
    \begin{cases}
        \eta = \textrm{nanu nanu} \\
        \rho = \textrm{nanu nanu} \\
        \tau = \textrm{nanu nanu} \\
    \end{cases}
\end{align*}
\end{document}

Answer 1

这样的事情怎么样？

\documentclass[11pt,fleqn]{book} 
\usepackage{pgfplots}
\pgfplotsset{compat=1.14}
\usepackage{pgfplotstable}
\usepgfplotslibrary{polar}

\usepgflibrary{shapes.geometric}
\usetikzlibrary{calc}
\usepackage{tikz}
\usepackage{array}
% highlighting throughout the book
\usepackage{mathptmx} % Use the Adobe Times Roman as the default text font 
                      % together with math symbols from the Symbol, 
                      % Chancery and Computer Modern fonts
\usepackage{microtype} % Slightly tweak font spacing for aesthetics
\usepackage[utf8]{inputenc} % Required for including letters with accents
\usepackage[T1]{fontenc} % Use 8-bit encoding that has 256 glyphs
\usepackage{amsthm}
\usepackage{mathtools}       
\begin{document}
\begin{align*}
    \delta
    \begin{cases}
        \sigma  = \textrm{nanu nanu} &  \iota=[0 - 0.5]\\
        \beta   = \textrm{nanu nanu} &  \iota=(0.5 - 0.9)\\
        \tau    = \textrm{nanu nanu} &  \iota=[0.9 - 1]
    \end{cases}
    & \qquad
    \alpha 
    \begin{cases}
        \eta = \textrm{nanu nanu} \\
        \rho = \textrm{nanu nanu} \\
        \tau = \textrm{nanu nanu} \\
    \end{cases}
\end{align*}
\end{document}