The many faces of projective objects
In mathematics and physics, there is quite a long list of objects which are, in some way, related to each other. It can be useful to keep down a little list of those various types of objects and their relationships.
Probably the oldest such objects are the ones related to projective geometry.
Quaternions are defined as an algebra over a $4$-dimensional vector space
Last updated : 2021-11-18 14:04:56