A regular surface is called orientable if each tangent space has a complex structure such that is a continuous function.
Orientable Surface
See also
Nonorientable Surface, Regular SurfaceExplore with Wolfram|Alpha
References
Gray, A. Modern Differential Geometry of Curves and Surfaces with Mathematica, 2nd ed. Boca Raton, FL: CRC Press, p. 318, 1997.Referenced on Wolfram|Alpha
Orientable SurfaceCite this as:
Weisstein, Eric W. "Orientable Surface." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OrientableSurface.html