The projective plane ℝP 2\mathbb{R}P^2 over the real numbers.
The non-orientable closed real surface of crosscap number=11.
real projective space, real projective line?
complex projective plane
quaternionic projective plane
octonionic projective plane
Last revised on January 15, 2025 at 11:48:24. See the history of this page for a list of all contributions to it.