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I am trying to split up the longest set (the super long expression) here into multiple lines, I've looked at some other similar questions on this forum and tried a few different things but nothing seems to be working. I want it all aligned left like normal.

\documentclass{article}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{amstext}
\usepackage{amssymb}
\begin{document}
\begin{enumerate}
\item Problem 1
$\varnothing \times B= \varnothing$ because $\varnothing \times B=\left \{ (a,b):a\in      \varnothing , b\in B \right \}$ but there are no elements in $\varnothing$
\item $(A \times B)\times B$

From (a): $(A \times B)=\left \{ (1,c),(2,c),(3,c),(4,c),(1,a),(2,a),(3,a),(4,a) \right \}$
$(A \times B)\times B=$ 
\left \{ ((1,c),a),((2,c),a),((3,c),a),((4,c),a),((1,a),a),((2,a),a),((3,a),a),((4,a),a),((1,c),c),((2,c),c),((3,c),c),((4,c),c),((1,a),c),((2,a),c), ((3,a),c),((4,a),c) \right \} 


\end{enumerate}
\end{document}
3
  • amsmath loads amstext.
    – cfr
    Commented Apr 5, 2015 at 3:47
  • If an answer addresses your question, you should mark it as such with a "Vee" symbol.
    – Yossi Gil
    Commented Apr 5, 2015 at 6:39
  • 1
    It seems as if you are making your first steps with LaTeX. You may find it useful to consult the resources mentioned in this question: tex.stackexchange.com/questions/11/…
    – Yossi Gil
    Commented Apr 5, 2015 at 6:42

1 Answer 1

1

To break lines started with ${$ use "\right." and to start the next line use "\left." if ending that line with $}$. This is used in the example.

\documentclass{article}
  \usepackage{amsmath}
  \usepackage{graphicx}
  \usepackage{amssymb}
  \begin{document}
  \begin{enumerate}
  \item Problem 1
  $\varnothing \times B= \varnothing$ because $\varnothing \times B=\left \{ (a,b):a\in 
  \varnothing , b\in B \right \}$ but there are no elements in $\varnothing$
  \item $(A \times B)\times B$

  From (a): $(A \times B)=\left \{ (1,c),(2,c),(3,c),(4,c),(1,a),(2,a),    (3,a),(4,a) \right \}$
  \begin{align}
  (A \times B)\times B &=
  \left \{ ((1,c),a),((2,c),a),((3,c),a),((4,c),a),((1,a),a), \right.       \nonumber\\
& \hspace{5mm} \left. ((2,a),a), ((3,a),a),((4,a),a)
,((1,c),c),((2,c),c), \right. \nonumber\\
& \hspace{5mm} \left. ((3,c),c),((4,c),c),((1,a),c),((2,a),c), ((3,a),c),((4,a),c) \right \}
  \end{align}

  \end{enumerate}
  \end{document}

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