Show border around expression in LyX (/ LaTeX)

Question

Can I draw a box around an expression? For example, if I presented a calculation, I want to draw attention to the result by drawing a “box” around it.

I saw this in some articles on LaTeX. Is it possible to do in LyX without ERT? Otherwise, how is this done in LaTeX?

Answer 1

Use \boxed.

\boxed{\nabla\cdot B = 0}