A minimal triangulation of complex projective plane admitting a chess colouring of four-dimensional simplices
We construct and study a new 15-vertex triangulation X of the complex projective plane ℂP2. The automorphism group of X is isomorphic to S 4 × S 3. We prove that the triangulation X is the minimal (with respect to the number of vertices) triangulation of ℂP2 admitting a chess colouring of four-dimensional simplices. We provide explicit parametrizations for the simplices of X and show that the automorphism group of X can be realized as a group of isometries of the Fubini-Study metric. We find a 33-vertex subdivision \( \bar X \) of the triangulation X such that the classical moment mapping μ: ℂP2 → Δ2 is a simplicial mapping of the triangulation \( \bar X \) onto the barycentric subdivision of the triangle Δ2. We study the relationship of the triangulation X with complex crystallographic groups.
KeywordsSTEKLOV Institute Simplicial Complex Solid Torus Barycentric Subdivision Complex Projective Plane
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