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Barth sextic : ウィキペディア英語版 | Barth surface
In algebraic geometry, a Barth surface is one of the complex nodal surfaces in 3 dimensions with large numbers of double points found by . Two examples are the Barth sextic of degree 6 with 65 double points, and the Barth decic of degree 10 with 345 double points. Some admit icosahedral symmetry. For degree 6 surfaces in P3, showed that 65 is the maximum number of double points possible. The Barth sextic is a counterexample to an incorrect claim by Francesco Severi in 1946 that 52 is the maximum number of double points possible. ==See also==
*Endrass surface *Sarti surface *Togliatti surface *List of algebraic surfaces
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