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Obstruction theory
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#	Item
11	Descent obstructions and Brauer-Manin obstruction in positive characteristic David Harari and Jos´e Felipe Voloch September 21, 2011 Abstract. We prove that the Brauer-Manin obstruction is the only obstruction to the ex Add to Reading List Source URL: www.ma.utexas.edu Language: English - Date: 2011-09-21 09:52:45 Algebraic geometry Ring theory Algebraic number theory Homological algebra Algebraic structures Principal homogeneous space Torsor Brauer group tale cohomology Morphism of algebraic varieties tale morphism Integral element
12	About the problem Obstruction from ergodic theory Complexity of nilsystems Complexity of nilsystems and systems lacking nilfactors Alejandro Maass Add to Reading List Source URL: fourier.math.uoc.gr Language: English - Date: 2013-06-04 11:31:14
13	On Computing Graph Minor Obstruction Sets ∗ Kevin Cattell Department of Computer Science University of Victoria Victoria, B.C. V8W 3P6, Canada Add to Reading List Source URL: www.mrfellows.net Language: English - Date: 2009-10-06 02:54:05 Robertson–Seymour theorem Tree decomposition Minor Planar graph Linkless embedding Graph coloring Graph structure theorem Clique-sum Graph theory Graph operations Path decomposition
14	Lubin Tate Cohomology and Deformations of n-buds Jonathan Beardsley Abstract We reprove Lazard’s result that every commutative n-bud is extendible to an n + 1 bud, from an obstruction theoretic point of view. We locate Add to Reading List Source URL: math.jhu.edu Language: English - Date: 2014-09-19 15:09:22 Algebra Group cohomology Formal group Cohomology Sheaf Degree of a continuous mapping Homology theory Continuous game Abstract algebra Topology Algebraic topology
15	Journal of Universal Computer Science, vol. 3, no), submitted: 8/8/97, accepted: , appeared:  Springer Pub. Co. A Note on the Computability of Graph Minor Obstruction Sets for Mona Add to Reading List Source URL: www.mrfellows.net Language: English - Date: 2009-10-14 09:38:23 Path decomposition Minor Tree Edge contraction Forbidden graph characterization Graph Neighbourhood Planar graph Connectivity Graph theory Graph operations Robertson–Seymour theorem
16	ENLARGEABILITY AND INDEX THEORY B. Hanke and T. Schick Abstract Let M be a closed enlargeable spin manifold. We show nontriviality of the universal index obstruction in the K-theory of the maximal C ∗ -algebra of the f Add to Reading List Source URL: www.math.uni-augsburg.de Language: English - Date: 2013-12-05 22:03:01 Algebraic topology Fiber bundles Differential topology Differential geometry Connection Vector bundle Connection form Holonomy Tangent space Topology Mathematical analysis Mathematics
17	POSITIVE SCALAR CURVATURE, K-AREA AND ESSENTIALNESS BERNHARD HANKE A BSTRACT. The Lichnerowicz formula yields an index theoretic obstruction to positive scalar curvature metrics on closed spin manifolds. The most general Add to Reading List Source URL: www.math.uni-augsburg.de Language: English - Date: 2013-12-05 22:36:21 Curvature Differential geometry Differential topology Geometric topology Riemannian geometry Differentiable manifold Ricci curvature Sectional curvature Surgery theory Topology Mathematical analysis Geometry
18	ENLARGEABILITY AND INDEX THEORY B. Hanke and T. Schick Abstract Let M be a closed enlargeable spin manifold. We show nontriviality of the universal index obstruction in the K-theory of the maximal C ∗ -algebra of the f Add to Reading List Source URL: www.math.uni-augsburg.de Language: English - Date: 2013-12-05 22:03:01 Algebraic topology Fiber bundles Differential topology Differential geometry Connection Vector bundle Connection form Holonomy Tangent space Topology Mathematical analysis Mathematics
19	POSITIVE SCALAR CURVATURE, K-AREA AND ESSENTIALNESS BERNHARD HANKE A BSTRACT. The Lichnerowicz formula yields an index theoretic obstruction to positive scalar curvature metrics on closed spin manifolds. The most general Add to Reading List Source URL: www.math.uni-augsburg.de Language: English - Date: 2013-12-05 22:36:21 Curvature Differential geometry Differential topology Geometric topology Riemannian geometry Differentiable manifold Ricci curvature Sectional curvature Surgery theory Topology Mathematical analysis Geometry
20	THE HASSE PRINCIPLE AND THE BRAUER-MANIN OBSTRUCTION FOR CURVES E.V. FLYNN Abstract. We discuss a range of ways, extending existing methods, to demonstrate violations of the Hasse principle on curves. Of particular inter Add to Reading List Source URL: people.maths.ox.ac.uk Language: English - Date: 2006-07-08 18:57:36 Vector bundles Algebraic number theory Field theory Number theory Algebraic curves Elliptic curve Divisor Canonical bundle Hasse principle Abstract algebra Mathematics Algebraic geometry

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