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- W2040303305 abstract "Let W -> X be a real smooth projective threefold fibred by rational curves. Kollar proved that if W(R) is orientable a connected component N of W(R) is essentially either a Seifert fibred manifold or a connected sum of lens spaces. Let k : = k(N) be the integer defined as follows: If g : N -> F is a Seifert fibration, one defines k : = k(N) as the number of multiple fibres of g, while, if N is a connected sum of lens spaces, k is defined as the number of lens spaces different from P^3(R). Our Main Theorem says: If X is a geometrically rational surface, then k <= 4. Moreover we show that if F is diffeomorphic to S^1xS^1, then W(R) is connected and k = 0. These results answer in the affirmative two questions of Kollar who proved in 1999 that k <= 6 and suggested that 4 would be the sharp bound. We derive the Theorem from a careful study of real singular Del Pezzo surfaces with only Du Val singularities." @default.
- W2040303305 created "2016-06-24" @default.
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- W2040303305 date "2007-05-06" @default.
- W2040303305 modified "2023-09-27" @default.
- W2040303305 title "Real singular Del Pezzo surfaces and threefolds fibred by rational curves, I" @default.
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