projective geometry

It has often been said that metric geometry was quantitative, while projective geometry was purely qualitative.

He also published several papers on algebraic forms and projective geometry.

It is difficult, at the outset, to characterize projective geometry as compared with Euclidean.

The others are said to be projective properties, and their investigation forms the subject of projective geometry.

This is essentially a theorem of projective geometry, but the following statical proof is interesting.