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References to 'projective line'
1.
central collineations
by
Algeboy
2.
derivation of 2D reflection matrix
by
stevecheng
3.
fundamental theorem of projective geometry
by
Algeboy
4.
geometry as the study of invariants under certain transformations
by
rspuzio
5.
projective geometry
by
Algeboy
6.
projective plane
by
yark
7.
topics on low dimensional topology
by
juanman
