A surface parameterized in variables u and v is called smooth if the tangent vectors in the u and v directions satisfy T_uxT_v!=0, where AxB is a cross product.
CITATION STYLE
Berger, M. (2010). Smooth surfaces. In Geometry Revealed (pp. 341–407). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-540-70997-8_6
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