\[
\begin{array}{|c|c|c|}
\hline
\text{Set} & \text{Operation} & \text{Identity} \\
\hline
\mathbb{Z} & + & 0 \\
\hline
\mathbb{Q} & + & 0 \\
\hline
\mathbb{R} & + & 0 \\
\hline
\mathbb{Z} & \times & 1 \\
\hline
\mathbb{Q} & \times & 1 \\
\hline
\mathbb{R} & \times & 1 \\
\hline
\end{array}
\]
by using LaTeX/MathJax.
The code that produces this table is:
- \[
- \begin{array}{|c|c|c|}
- \hline
- \text{Set} & \text{Operation} & \text{Identity} \\
- \hline
- \mathbb{Z} & + & 0 \\
- \hline
- \mathbb{Q} & + & 0 \\
- \hline
- \mathbb{R} & + & 0 \\
- \hline
- \mathbb{Z} & \times & 1 \\
- \hline
- \mathbb{Q} & \times & 1 \\
- \hline
- \mathbb{R} & \times & 1 \\
- \hline
- \end{array}
- \]
Enjoy.