| http://www.w3.org/ns/prov#value | - For smooth functions, the key property is how they behave near a critical point since near a regular point the behavior is regular - essentially just that of a straight line or a plane in higher dimensions. is a function of more than one variable its local geometry near a nondegenerate critical point looks like a saddle, since the graph of the function is a surface that may bend in different direc
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