Trying to understand how vectors change in inertial and non-inertial frames
Am I right in saying vectors are defined by their invariance under coordinate transformations? My main question is are vectors invariant when shifting between inertial and non-inertial frames of reference.
My textbook says: $$\vec{A} = A_{i}\vec{e}_{i}=A_j\vec{e}_{j}$$
where the i basis vectors are an inertial frame, K, and the j vectors are non-inertial, K', therefore time dependent inside the K frame.
Taking the rate of change: $$\vec{\dot{A}|_{k}} = \vec{\dot{A}|_{k'}} + \omega\times\vec{A} $$
The first term on LHS corresponds to rate of change of A vector in K', but for the second term, which frame is A being measured in. From the first equation, it seems like it can be either since the vector is the same, but is a vector in an inertial frame the same as one in a non-inertial frame?
My guess would be it can't be due to the existence of inertial forces.
If so, can you explain how the first equation makes sense?
Thanks, I don't have much experience with linear algebra.