Hi, I'm trying to derive the Frenet Serret Formulas, but I am having trouble to understand why, after some checking, that the derivative of binormal vector is:
\frac{d\hat{b}}{ds}=-\tau\hat{n}
I understand that, \hat{t}\wedge\frac{d\hat{n}}{ds}\parallel\hat{n} and |\frac{d\hat{b}}{ds}|=\tau...