## 9

To define the Second Fundamental Form let us form the derivatives:

so that the quantities:

define the Second Fundamental Form.

The Gaussian quantities: LN - M2 = 0 and L2 + M2 + N2 = 0. The points of the surface are then parabolic.

It is well known that the main curvatures k are obtained from the solution of the following equation:

Then:

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