Function Vmatrix

pub fn Vmatrix<I>(items: I) -> MathML
where
    I: IntoIterator<Item = MathML>,

Renders a matrix with double vertical bars.

Input

\begin{Vmatrix} a & b \\ c & d \end{Vmatrix}

Output

$$\Vert \begin{array}{cc}a& b\\ c& d\end{array}\Vert$$