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第17講 Orientation of a Surface

L17_A
       1. Definition: Orientable Surface
       2. Example: Surface Covered by One Parametrization
 
L17_B
       1. Example: Surface Covered by Two Parametrizations
       2. Proposition: A Surface Is Orientable if and only if
           It Has a Differentiable Unit Normal Vector Field
 
L17_C
       1. Proposition: A Surface Is Orientable if and only if
           
It Has a Differentiable Unit Normal Vector Field (cont.)
       2. Example: Mobius Band

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