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Book
On the morphological structure of a network
Authors: --- --- ---
Year: 2005 Publisher: Gent Vlerick Leuven Gent management school

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Book
Convexity of Singular Affine Structures and Toric-Focus Integrable Hamiltonian Systems
Authors: --- ---
ISBN: 1470475405 9781470475406 Year: 2023 Publisher: Providence, RI : American Mathematical Society,

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"This work is devoted to a systematic study of symplectic convexity for integrable Hamiltonian systems with elliptic and focus-focus singularities. A distinctive feature of these systems is that their base spaces are still smooth manifolds (with boundary and corners), analogous to the toric case, but their associated integral affine structures are singular, with non-trivial monodromy, due to focus singularities. We obtain a series of convexity results, both positive and negative, for such singular integral affine base spaces. In particular, near a focus singular point, they are locally convex and the local-global convexity principle still applies. They are also globally convex under some natural additional conditions. However, when the monodromy is sufficiently large, the local-global convexity principle breaks down and the base spaces can be globally non-convex, even for compact manifolds. As a surprising example, we construct a 2-dimensional "integral affine black hole", which is locally convex but for which a straight ray from the center can never escape"--


Book
Non-archimedean tame topology and stably dominated types
Authors: ---
ISBN: 1400881226 9781400881222 9780691161693 9780691161686 0691161682 9780691161686 0691161690 9780691161693 Year: 2016 Publisher: Princeton

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Over the field of real numbers, analytic geometry has long been in deep interaction with algebraic geometry, bringing the latter subject many of its topological insights. In recent decades, model theory has joined this work through the theory of o-minimality, providing finiteness and uniformity statements and new structural tools. For non-archimedean fields, such as the p-adics, the Berkovich analytification provides a connected topology with many thoroughgoing analogies to the real topology on the set of complex points, and it has become an important tool in algebraic dynamics and many other areas of geometry. This book lays down model-theoretic foundations for non-archimedean geometry. The methods combine o-minimality and stability theory. Definable types play a central role, serving first to define the notion of a point and then properties such as definable compactness. Beyond the foundations, the main theorem constructs a deformation retraction from the full non-archimedean space of an algebraic variety to a rational polytope. This generalizes previous results of V. Berkovich, who used resolution of singularities methods. No previous knowledge of non-archimedean geometry is assumed. Model-theoretic prerequisites are reviewed in the first sections.

Keywords

Tame algebras. --- Algebras, Tame --- Associative algebras --- Abhyankar property. --- Berkovich space. --- Galois orbit. --- Riemann-Roch. --- Zariski dense open set. --- Zariski open subset. --- Zariski topology. --- algebraic geometry. --- algebraic variety. --- algebraically closed valued field. --- analytic geometry. --- birational invariant. --- canonical extension. --- connectedness. --- continuity criteria. --- continuous definable map. --- continuous map. --- curve fibration. --- definable compactness. --- definable function. --- definable homotopy type. --- definable set. --- definable space. --- definable subset. --- definable topological space. --- definable topology. --- definable type. --- definably compact set. --- deformation retraction. --- finite simplicial complex. --- finite-dimensional vector space. --- forward-branching point. --- fundamental space. --- g-continuity. --- g-continuous. --- g-open set. --- germ. --- good metric. --- homotopy equivalence. --- homotopy. --- imaginary base set. --- ind-definable set. --- ind-definable subset. --- inflation homotopy. --- inflation. --- inverse limit. --- iso-definability. --- iso-definable set. --- iso-definable subset. --- iterated place. --- linear topology. --- main theorem. --- model theory. --- morphism. --- natural functor. --- non-archimedean geometry. --- non-archimedean tame topology. --- o-minimal formulation. --- o-minimality. --- orthogonality. --- path. --- pro-definable bijection. --- pro-definable map. --- pro-definable set. --- pro-definable subset. --- pseudo-Galois covering. --- real numbers. --- relatively compact set. --- residue field extension. --- retraction. --- schematic distance. --- semi-lattice. --- sequence. --- smooth case. --- smoothness. --- stability theory. --- stable completion. --- stable domination. --- stably dominated point. --- stably dominated type. --- stably dominated. --- strong stability. --- substructure. --- topological embedding. --- topological space. --- topological structure. --- topology. --- transcendence degree. --- v-continuity. --- valued field. --- Γ-internal set. --- Γ-internal space. --- Γ-internal subset.

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