Article 4 (based on the OOP structure) will probably be finished today. The class that will be constructed in Article 5 is based on the one built in Article 4. Article 4 is about projective geometry while in Article 5, the point at infinity is mirrored (the north and south poles) and so projective geometry turns into stereographic projection.
I think, to avoid confusion, it’s better to discuss them in different articles. So probably I’ll post the first version of article 4 tomorrow.
UPDATE 1:
Structures should be extendable. So it’s good to show that this structure is. So it might be better if the Riemann sphere is discussed in the same article. In this version, Minkowski is not generated entirely. It requires another type of reflection (CPT in SR) so that might be included as well.
This is the article so far:
https://1drv.ms/b/s!AnmqNbk0QgkYgP5fVMHJCC70WKrypw?e=FSEuwe