Talk:Real projective plane

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[edit] Homogeneous coordinates

Here:

The set of lines in the plane can be represented using homogeneous coordinates. A line ax+by+c=0 can be represented as (a:b:c).

whyare we speaking about "lines in the plane"? What has it to do with the projective plane?--Pokipsy76 16:06, 21 July 2006 (UTC)

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