Lagrangian blow-ups, blow-downs, and applications to real packing
نویسندگان
چکیده
منابع مشابه
Nonpositive curvature of blow - ups
Consider the following situation: MC is a complex manifold of complex dimension n, and DC is a union of smooth complex codimension-one submanifolds (i.e., DC is a smooth divisor). Examples of this situation include: (1) arrangements of projective hyperplanes in CP, as well as various blow-ups of such arrangements along intersections of hyperplanes, (2) nonsingular toric varieties (whereDC is th...
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A conjecture on vanishing and non-negativity of intersection multiplicity on the blow-up of a regular local ring at its closed point has been proposed. Proofs of vanishing, several special cases of non-negativity and a sufficient condition for non-negativity of this conjecture are described. The topic on intersection multiplicity on vector bundles is also addressed. Introduction. Let X be a reg...
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We extend the classical formula of Porteous for blowing-up Chern classes to the case of blow-ups of possibly singular varieties along regularly embedded centers. The proof of this generalization is perhaps conceptually simpler than the standard argument for the nonsingular case, involving Riemann-Roch without denominators. The new approach relies on the explicit computation of an ideal, and a m...
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This work connects the idea of a “blow-up” of a quiver with that of injectivity, showing that for a class of monic maps Φ, a quiver is Φ-injective if and only if all blow-ups of it are as well. This relationship is then used to characterize all quivers that are injective with respect to the natural embedding of Pn into Cn.
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Let TTk denote the transitive tournament on k vertices. Let TT (h, k) denote the graph obtained from TTk by replacing each vertex with an independent set of size h ≥ 1. The following result is proved: Let c2 = 1/2, c3 = 5/6 and ck = 1 − 2 k for k ≥ 4. For every ǫ > 0 there exists N = N(ǫ, h, k) such that for every undirected graph G with n > N vertices and with δ(G) ≥ ckn, every orientation of ...
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ژورنال
عنوان ژورنال: Journal of Symplectic Geometry
سال: 2014
ISSN: 1527-5256,1540-2347
DOI: 10.4310/jsg.2014.v12.n4.a4