I take $F$ from $\Omega\subset C^n$$\Omega\subset \mathbb C^n$ to $C^n$$\mathbb C^n$ to be a holomrphicholomorphic function such that $$| \det(J_F)|\leq 1,$$ where $J_F$ is the Jacobian matrix of $F$.
My question is: Is there any classification for these type of functionfunctions of this type?