Question

Discuss the formula for "K" and "T" when positive vector is in the form of general parameter of "u".
K=|r'×r"|/|r'|^3

T=[r', r",r"]/K^2(r')^6

Answer 1

K is a curvature of the curve. It shows how much a curve differs from a straight line. T is a torsion. It measures how sharply a curve is twisting out of the plane of curvature.