A way of handling \left and \right brackets

Question

I'm looking a way of making something like this:

\underbrace{
    \left[\nabla\times
    \left[\nabla\times
    \left[\ldots\nabla\times
}_{
    \infty\text{-times taking curl operator}
}
    \mathbf{V}\right]\right]\ldots\right] = ?

Answer 1

It's easy to achieve this inserting an appropriate \right and \left null delimiters:

\left.
\right.

The correspondent code would be:

\underbrace{
    \left[\nabla\times
    \left[\nabla\times
    \left[\ldots\nabla\times
    \right.\right.\right.
}_{
    \infty\text{-times taking curl operator}
}
    \mathbf{V}\left.\left.\left.\right]\right]\right]\ldots\right] = ?