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In mathematics, the complex projective plane, usually denoted P2(C), is the two-dimensional complex projective space. It is a complex manifold described by three complex coordinates : where, however, the triples differing by an overall rescaling are identified: : That is, these are homogeneous coordinates in the traditional sense of projective geometry. ==Topology== The Betti numbers of the complex projective plane are :1, 0, 1, 0, 1, 0, 0, ..... The middle dimension 2 is accounted for by the homology class of the complex projective line, or Riemann sphere, lying in the plane. The nontrivial homotopy groups of the complex projective plane are . The fundamental group is trivial and all other higher homotopy groups are those of the 5-sphere, i.e. torsion. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「complex projective plane」の詳細全文を読む スポンサード リンク
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