we need your help. We had some time trying this one: If P is an umbilical point then the second fundamental form is constant Thanks!
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What is the link between the second fundamental form and the normal curvature?
k_n = II(X,X) and k_n is constant. But I need that II(X,Y) constant. or am I wrong?
Originally Posted by kezman k_n = II(X,X) and k_n is constant. But I need that II(X,Y) constant. Use the bi-linearity.
kn=II(X,X) =???= II(X,Y). I need something in between to reach the right side????
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