Hello, 
I am taking a Linear Algebra course.  I would like to add the symbol for 
the set of real numbers.
According to this site, I should use "<$>\mathbb{R}<$>"
How to write a real number(ℝ) symbol in LaTeX? - Real number symbol 
(physicsread.com) <https://www.physicsread.com/latex-real-number/>
It is not working.

Do I need to add a package?

Thanks in advance!

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