Let S be a differentiable surface with parameterization?: R ?>> R(u, v)o(u, v) = (u, v, u - v).Find the normal, geodesic, Gaussian, mean, and

Let S be a differentiable surface with parameterization?: R² ?>> R³(u, v)o(u, v) = (u, v, u² - v²).Find the normal, geodesic, Gaussian, mean, and principal curvatures.