Talk:Coordinate systems/Derivation of formulas

This is a good reference for the del operator: http://johanw.home.xs4all.nl/contents.html It also contains lots of advanced Physics equations.

Alternative derivation
Under 'Cylindrical from Cartesian unit vectors' we have for example $$\begin{align} \hat{\boldsymbol\rho} &= \frac{ x \hat{\mathbf x} + y \hat{\mathbf y}}{\sqrt{x^2+y^2}} \\\end{align}$$ Should this not also include the 'projection' equivalent of $$\begin{align} \hat{\boldsymbol\rho}=\hat{\mathbf{x}}\cos\left({\phi}\right)+\hat{\mathbf{y}}\sin\left({\phi}\right) \\\end{align}$$ etc.? --Aksmith777 (discuss • contribs) 23:41, 28 March 2015 (UTC)


 * Yes, that is a good way to look at it. --Guy vandegrift (discuss • contribs) 04:30, 29 March 2015 (UTC)