L16A
        1. Review: Gauss’s Theorema Egregium
        2. Counterexample: The Converse of Gauss’s
             Theorema Egregium Is Not True

L16B
        1. Counterexample: The Converse of Gauss’s
             Theorema Egregium Is Not True (cont.)
        2. Theorem: Fundamental Theorem of Surface
             (Bonnet) 

L16C
        1. Example: Is There a Regular Surface with the Given
             Differentiable Functions E, F, G, e, f, g