1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
\documentclass{article} \usepackage{bbm} \begin{document} $A = B$ $\mathbbm{N} = \{ 0, 1, 2, 3, \ldots \}$ $\mathbbm{Z} = \{ \, n \mid n \in \mathbbm{N} \wedge -n \in \mathbbm{N} \,\}$ $x^y$ $x + \sum_x^y$ \[x + \sum_x^y\] \end{document}