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Abelian varieties and the Fourier transform by Alexander Polishchuk

By Alexander Polishchuk

The purpose of this ebook is to provide a contemporary therapy of the idea of theta services within the context of algebraic geometry. the newness of its process lies within the systematic use of the Fourier-Mukai rework. the writer begins through discussing the classical concept of theta features from the perspective of the illustration conception of the Heisenberg staff (in which the standard Fourier rework performs the favorite role). He then exhibits that during the algebraic method of this concept, the Fourier–Mukai rework can frequently be used to simplify the present proofs or to supply thoroughly new proofs of many very important theorems. Graduate scholars and researchers with robust curiosity in algebraic geometry will locate a lot of curiosity during this quantity.

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Stability Conditions and Positivity of Invariants of Fibrations 33 The converse implication is studied in [36]. Let us now briefly discuss the question. C; V /. Let us consider a proper saturated subsheaf G Â ML ;V . We have that G is generated by its global sections. V ! C; G //. The evaluation morphism W OC ! G is surjective. We thus have the following commutative diagram (cf. [17]) (12) where F is a vector bundle without trivial summands (this follows from the choice of W ). Note that the morphism ˛ is non-zero, because W OC is not contained in the image of ML ;V in V OC .

44 (AMS, Providence, 1996) 2. H. Clemens, P. Griffiths, The intermediate Jacobian of the cubic threefold. Ann. Math. 95(2), 281–356 (1972) 3. A. Collino, The fundamental group of the Fano surface I, II, in Algebraic Threefolds (Varenna, 1981). Lecture Notes in Mathematics, vol. 947 (Springer, Berlin/New York, 1982), pp. 209–220 4. A. Collino, Remarks on the topology of the Fano surface. 2621 5. -T. 2; C/ gives a bijection between isomorphism classes of nontrivial irreducible representations of G and irreducible components of the exceptional divisor in the minimal resolution of the quotient singularity A2C =G.

NC1/ 0 ! 1/ ! OPn ! 1/ ! 0: Applying the pullback of ' we obtain 0 ! 1// ! V OC ! L ! 0: Hence the kernel of the evaluation morphism coincides with the restriction of the cotangent bundle of the projective space Pn to the curve C . The -stability of the DSB is the stability condition assumed to hold on the general fibres for the method of Moriwaki. Proposition 10. C; V / is linearly (semi)stable. 0 Proof. Let us consider any gdr 0 1 in jV j. Let V 0 be the associated subspace of V . Consider the evaluation morphism V 0 OC !

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