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projective plane : FOLDOC | projective plane The space of equivalence classes of vectors under non-zero scalar multiplication. Elements are sets of the form {kv: k != 0, k scalar, v != O, v a vector}
where O is the origin. v is a representative member of this equivalence class. The projective plane of a vector space is the collection of its 1-dimensional {subspaces}. The properties of the vector space induce a topology and notions of {smoothness} on the projective plane. A projective plane is in no meaningful sense a plane and would therefore be (but isn't) better described as a "projective space". (1996-09-28)
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