Ciro Santilli
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Real projective line (
R
P
1
,
P
(
R
2
)
)
wiki
Real projective space
nosplit
words:
20
Just a
circle
.
Take
R
2
with a line at
x
=
0
. Identify all the points that an observer
Ancestors
Real projective space
Projective geometry
Geometry
Mathematics
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Synthetic geometry of the real projective plane