File:Fano plane projective line symmetries scan.jpg - Wikimedia Commons
Projective line over a ring - Wikipedia
general topology - Prove that the real projective line cannot be embedded into Euclidean space - Mathematics Stack Exchange
The principles of projective geometry applied to the straight line and conic . ll meet u in a point W. The projection of this point W on the lineu is the
Projective line over a finite field - Wikimedia Commons
Why can the 1-D projective line, defined as a real number line segment R plus a point at infinity, come to be defined as the vector space of 1-D subspaces in a
Complex projective space - Wikipedia
Cross-ratio - Wikipedia
Linear Algebra/Topic: Projective Geometry - Wikibooks, open books for an open world