How can we define a smooth domain in $\mathbb{C}^2$ and a smooth boundary of bounded domain in $\mathbb{C}^2$?
{where $\mathbb{C}^2$ := Cartesian product of complex plane }
How can we define a smooth domain in $\mathbb{C}^2$ and a smooth boundary of bounded domain in $\mathbb{C}^2$?
{where $\mathbb{C}^2$ := Cartesian product of complex plane }