\begin{matrix}
{A = A} \\
{\mathbf{A} = \mathbf{A}} \\
{A = \mathit{A}} \\
{{\mathbf{A}} = \mathbf{A}} \\
{{\mathbb{A}} = \mathbb{A} = {\mathbb{A}}} \\
{\mathcal{A} = \mathcal{A} = \mathcal{A}} \\
{{\mathcal{A}} = \mathcal{A}} \\
{{\mathfrak{A}} = \mathfrak{A} = {\mathfrak{A}}} \\
{{\mathfrak{A}} = \mathfrak{A}} \\
{\mathsf{A} = \mathsf{A}} \\
{{\mathbf{A}} = \mathbf{A}} \\
{{\mathsf{A}} = \mathsf{A}} \\
{{\mathbf{A}} = \mathbf{A}} \\
{\mathtt{A} = \mathtt{A}} \\
\end{matrix}
