\underbrace{a+b+c}_{\text{note}}The \underbrace command in LaTeX is used to place a brace under a mathematical expression, with an optional annotation or note below the brace. This is particularly useful for highlighting or explaining parts of an equation or expression, making it clear which terms are grouped together or what they represent.
Annotating the sum of terms a, b, and c.
\underbrace{a+b+c}_{\text{sum of terms}}Highlighting the Pythagorean theorem.
\underbrace{x^2 + y^2 = z^2}_{\text{Pythagorean theorem}}Annotating a definite integral from 0 to 1.
\underbrace{\int_0^1 x^2 \, dx}_{\text{definite integral}}