So I have a query concerning position vectors and cylindrical coordinates.
In my electromagnetism text(undergrad) there's the following statements for
position vectors in cylindrical coordinates:
$$\vec r = \rho \cos\phi \hat x + \rho \sin\phi \hat y+z\hat z$$
I understand this statement, it's the following, I don't understand how a 3D position can be expressed thusly:
$$\vec r = \rho \hat \rho + z \hat z$$
Thanks for any insight and help!