L1A
      1. Definition: Parametrized Curves
      2. Examples: Parametrized Differentiable Curves
 
L1B
      1. Note: Difference Between Curve and Trace 
      2. Definition: Regular Curves
      3. Example: Helix
 
L1C
      1. Example: Helix (cont.) 
      2. Definition: The Arc Length of a Regular Curve