1. ## simple intersection question

I have a simple question, because my book doesn't give an example

For example $\displaystyle \left\{\left\{1\right\},\left\{2\right\}\right\} \cap \left\{\left\{1\right\},\left\{2,3\right\},\left\{ 1,2\right\}\right\}$
does this give $\displaystyle \left\{\left\{1\right\}\right\}$

thx for the help

2. Yes it does.