New PDF release: Geometry and Arithmetic

By Carel Faber, Gavril Farkas, Robin de Jong, Carel Faber, Gavril Farkas, Robin de Jong

ISBN-10: 3037191198

ISBN-13: 9783037191194

This quantity comprises 21 articles written through major specialists within the fields of algebraic and mathematics geometry. The handled subject matters variety over numerous topics, together with moduli areas of curves and abelian types, algebraic cycles, vector bundles and coherent sheaves, curves over finite fields, and algebraic surfaces, between others. the quantity originates from the convention "Geometry and Arithmetic," which was once hung on the island of Schiermonnikoog within the Netherlands in September 2010. A e-book of the eu Mathematical Society (EMS). dispensed in the Americas through the yank Mathematical Society

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For this we show that H 0 (E1 × E2 , p∗1 (OE1 (2[0]))) ⊗ p∗2 (OE2 (2[0])))H ∼ = C2 . In fact, H 0 (E1 × E2 , p∗1 (OE1 (2[0]))) ⊗ p∗2 (OE2 (2[0]))) = V1 ⊗ V2 = = (V1+++ ⊕ V1++− ) ⊗ (V2+++ ⊕ V2++− ), whence H 0 (E1 × E2 , p∗1 (OE1 (2[0]))) ⊗ p∗2 (OE2 (2[0])))H = = (V1+++ ⊗ V2+++ ) ⊕ (V1++− ⊗ V2++− ). Therefore we have a pencil of H-invariant divisors Dc := {(z1 , z2 ) ∈ E1 × E2 | L1 (z1 )L2 (z2 ) = c}. It is now obvious that Dc is G - invariant iff c = ±b1 b2 . The change of sign for bi is achieved by changing the point τ4i by τ4i + 12 .

H (Y, ⊕ OD ) i i=1 Y A standard argument shows that δ is injective (see [Cat84]). In fact, the Chern classes of S1 , S2 , S3 , S4 are linearly independent, hence ϕ is injective, which implies that also δ is injective. Therefore h0 (Ω1Y (log D1 , log D2 , log D3 )(KY )) = h2 (ΘS˜ )inv = h2 (ΘS )inv = 0. Therefore h1 (ΘS˜ )inv = −χ(Ω1Y (log D1 , log D2 , log D3 )(KY )) = = −(χ(Ω1Y (KY )) + χ(⊕3i=1 ODi (KY ))). 3) An easy calculation shows now that χ(⊕3i=1 ODi (KY )) = 0, whereas χ(Ω1Y (KY )) = −4.

3) An easy calculation shows now that χ(⊕3i=1 ODi (KY )) = 0, whereas χ(Ω1Y (KY )) = −4. 6. ˜ Θ ˜ )1 = h2 (S, ΘS )1 ≤ 2; (1) h0 (Y, Ω1Y (log D1 )(KY + L1 )) = h2 (S, S ˜ Θ ˜ )2 = h2 (S, ΘS )2 ≤ 3; (2) h0 (Y, Ω1Y (log D2 )(KY + L2 )) = h2 (S, S ˜ Θ ˜ )3 = h2 (S, ΘS )3 ≤ 3. (3) h0 (Y, Ω1Y (log D3 )(KY + L3 )) = h2 (S, S In particular, we get h2 (S, ΘS ) ≤ 8. 7. Let S be an Inoue surface with KS2 = 7, pg = 0. Then: h2 (S, ΘS ) = 8, h1 (S, ΘS ) = h1 (S, ΘS )inv = 4. Proof of the corollary. 6 8 − h1 (S, ΘS ) ≥ h2 (S, ΘS ) − h1 (S, ΘS ) = χ(ΘS ) = 2KS2 − 10χ(S) = 4, whence h1 (S, ΘS ) ≤ 4.

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Geometry and Arithmetic by Carel Faber, Gavril Farkas, Robin de Jong, Carel Faber, Gavril Farkas, Robin de Jong


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