LaTeX Forum

\documentclass{scrbook}
\usepackage{amsmath}
\begin{document}
\begin{equation}
  V_{Rd}=min
  \begin{cases} 
    V_{Rd,s}=(A_{sw}/s)\cdot z \cdot f_{ywd}\cdot cot (\theta) \\ 
    V_{Rd,max}=b_w \cdot z \cdot \nu_{1} \cdot f_{cd} / (cot (\theta) + tan (\theta)) 
  \end{cases}
\end{equation} 
\end{document}

\documentclass{scrbook}
\usepackage{cases}
\usepackage[a4paper,margin=3cm]{geometry}

\begin{document}
\begin{numcases}{|x|=}
    x, & for $x \geq 0$\\
    -x, & for $x < 0$
\end{numcases}
\end{document}

$  V_{Rd}=min\left\{
	\begin{array}{cl}
		V_{Rd,s}=(A_{sw}/s)\cdot z \cdot f_{ywd}\cdot cot (\theta) \\                
		V_{Rd,max}=b_w \cdot z \cdot \nu_{1} \cdot f_{cd} / (cot (\theta) + tan (\theta))
	\end{array}
	\right. $