all.
I'm looking for a way to calculate angle between two hyperplanes. I've seen many answers of calculating angle between 2D planes within 3D plane, but this is not the case as described below.
Let's say two subspaces ${A}$ and ${B}$ occupy ${a}$ and ${b}$ dimensional subspace respectively within ${N}$ dimension. Then how should I calculate angle between those two subspaces? (In the case where $a+b < N$, which means that there is no intersecting hyperplane except for the origin.)
When $a+b > N$, this is the case for calculating angle between 2D planes within 3D plane, and seems it could be generalized to Dihedral angle.
I'm thinking whether the angle even exists in such case, but not sure. Any Ideas on this?