L3_A
1. Definition: Torsion of a Curve Parametrized by Arc Length
2. Derivation: Frenet Formula
L3_B
1. Definition: Normal Plane and Rectifying Plane
2. Example: Helix
L3_C
1. Theorem: A Curve with Positive Curvature Is a Plane Curve
if and only if Its Torsion Is Identically Zero
10610 池盷恩同學幾何筆記.pdf
