\begin{table}
\centering
\begin{tblr}[         %% tabularray outer open
]                     %% tabularray outer close
{                     %% tabularray inner open
colspec={Q[]},
hline{2}={1}{solid, black, 0.05em},
hline{1}={1}{solid, black, 0.1em},
hline{4}={1}{solid, black, 0.1em},
column{1}={}{halign=c},
}                     %% tabularray inner close
Math \\
$x^2 + y^2 = z^2$ \\
$\frac{1}{2}$ \\
\end{tblr}
\end{table} 
