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A locally-built, LLM-digested index of recent arXiv papers in quant finance, geometry/topology, and statistical ML — keyword search served straight from SQLite on this machine.

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48 results for admissible quotients

This paper classifies all admissible quotients of a surface braid group up to order 127.

problem Classifying admissible quotients of surface braid groups with bounded order.
method Analyzing finite quotients of the pure braid group on two strands of a Riemann surface.
result All admissible quotients of the braid group have order at most 127.

Paper investigates curvature problems and existence of solutions.

problem Existence of admissible solutions to curvature problems.
method Investigates curvature problems with prescribed LpL_p quotient type, proving existence under specific conditions.
result Proves existence of admissible solutions without additional conditions.

The paper proves Liouville rigidity for Hessian equations, characterizing geometric conditions for constant solutions.

problem Characterizing geometric conditions for constant solutions in Hessian equations.
method Recursive geometric condition (Liouville admissibility) and anisotropic constructions.
result The Liouville-type property is characterized as a geometric property of the admissible set.

By a recent result, it is known that compact homogeneous spaces with co-index of symmetry 4 are quotients of a semisimple Lie group of dimension at most 10. In this paper we determine exactly which ones of these spaces actually admit such a metric. For all the admissible spaces we construct explicit examples of these m…

2018-12-12abs ↗pdf ↗

We first recall some basic definitions and facts about Jacobi manifolds, generalized Lie bialgebroids, generalized Courant algebroids and Dirac structures. We establish an one-one correspondence between reducible Dirac structures of the generalized Lie bialgebroid of a Jacobi manifold (M,Λ,E)(M,Λ,E) for which 1 is an admiss…

2004-12-11abs ↗pdf ↗

Criterion for solvability of complex 2-Hessian equation on compact Kähler manifolds.

problem Solvability of complex 2-Hessian equation on compact Kähler manifolds.
method Nakai--Moishezon-type criterion associated with the complex 2-Hessian equation.
result Criterion equivalent to existence of a smooth 2-admissible representative in complex dimension three.

The paper proves Mabuchi solitons and constants on Fano admissible manifolds.

problem Existence of Mabuchi solitons on Fano admissible manifolds.
method Defined Mabuchi solitons and constants, proved existence and non-existence.
result Fano admissible manifolds admit Mabuchi solitons if and only if the Mabuchi constant is less than 1.

A Lie-admissible algebra gives by anticommutativity a Lie algebra. In this work we study remarkable classes of Lie-admissible algebras such as Vinberg, PreLie algebras. We compute the corresponding binary quadratic operads and study their Koszul duality. Considering Lie algebras as Lie-admissible algebras we can define…

2002-10-18abs ↗pdf ↗

Investigates admissible metrics on compact Kähler varieties and their stability.

problem Existence of admissible metrics on compact Kähler varieties and their stability.
method Analyzes admissible Hermitian metrics and Hermitian-Yang-Mills metrics on slope stable coherent sheaves.
result Existence of admissible metrics and Hermitian-Yang-Mills metrics under certain conditions.

New examples show deletion type admissible pairs can be rigid under rational saturation.

problem Rigidity of admissible pairs of rational homogeneous spaces of Picard number one.
method Application of Mok's general criterion for non-subdiagram type admissible pairs.
result Examples of deletion type admissible pairs are rigid under rational saturation.

The paper proves a theorem and characterizes connections over normal varieties.

problem The study addresses the stability and connections over normal varieties.
method The authors prove a complete version of the Donaldson-Uhlenbeck-Yau theorem and use it to show the polystability of reflexive sheaves.
result An admissible Hermitian-Yang-Mills connection defines a polystable reflexive sheaf and gives a lower bound for discriminants.

Given a hyperbolic surface, the set of all closed geodesics whose length is minimal form a graph on the surface, in fact a so-called fat graph, which we call the systolic graph. We study which fat graphs are systolic graphs for some surface (we call these admissible). There is a natural necessary condition on such grap…

2015-03-06abs ↗pdf ↗

Study on pre-Lie structures for semisimple Lie algebras over C.

problem Admissibility of pre-Lie structures in semisimple Lie algebras.
method Examined properties of anti-flexible algebras (AFAs), computed Lie-admissibility criteria, and provided examples.
result Explicit counterexample of an AFA admissible by sl(2, C).

Statistical tests for fairness in admissions data reveal hidden patterns.

problem Simpson's paradox in admissions data hides true gender bias.
method Introduces a new statistical test based on Pearl's instrumental-variable inequalities.
result Statistical tests for fairness coincide with causal notions for the Berkeley admissions case.

Model predicts wound and episode-level readmission risk and time to re-admit.

problem Identify patients at high risk of re-admission to prevent wound recurrences and reduce healthcare costs.
method Data-driven analysis of wound care and episode-level patient data.
result Model achieves high recall and precision for predicting re-admission risk and time.

The choice of admissible trading strategies in mathematical modelling of financial markets is a delicate issue, going back to Harrison and Kreps (1979). In the context of optimal portfolio selection with expected utility preferences this question has been a focus of considerable attention over the last twenty years. We…

2009-10-20abs ↗pdf ↗

The paper characterizes curves in pseudo-Galilean 4-space.

problem Characterizing curves in the pseudo-Galilean 4-space G14G_{1}^{4}.
method Investigation and characterisation of admissible curves in terms of curvature functions.
result Necessary and sufficient conditions for admissible rectifying curves in G14G_{1}^{4}.

Model financial dynamics using 2-manifold geometries, revealing the torus as best for cyclical data.

problem Financial forecasting using complex market data.
method Embedding market data onto 2-manifolds (S2, R2, H2, T) guided by uniformization theorem, inferring latent curvature.
result The torus geometry best predicts cyclical financial data, aligning with IS-LM theory.

We prove that a potential qq can be reconstructed from the Dirichlet-to-Neumann map for the Schrodinger operator Δg+q-Δ_g + q in a fixed admissible 3-dimensional Riemannian manifold (M,g)(M,g). We also show that an admissible metric gg in a fixed conformal class can be constructed from the Dirichlet-to-Neumann map for $Δ_…

2010-11-02abs ↗pdf ↗

Combining forecasts of 16 ED causes improves accuracy and stability.

problem Forecasting accuracy and stability for ED admissions is poor due to model uncertainty and limited data.
method High-dimensional forecast combinations of 16 cause-specific ED forecasts using extensive covariates.
result Forecast combinations yield forecast accuracies of 3.81%-23.54% across causes, outperforming individual models in 50% of scenarios.

Symmetric spaces' connections form Lie admissible triple algebras.

problem Understanding the algebraic structure of symmetric spaces' connections.
method Analyzing the connection as a binary operator on tangent bundle sections, identifying Lie admissibility constraints.
result Connection algebra of symmetric spaces is a Lie admissible triple algebra.

Develops comparison methods for semilinear elliptic problems on Riemannian manifolds with Ricci lower bound.

problem Analyzing positive solutions of semilinear Dirichlet problems on Riemannian manifolds with Ricci lower bound.
method Sharp pointwise gradient comparison method, derived from admissibility and structural conditions on f.
result Explicit isoperimetric-type inequality and quantitative hot-spot localization estimate.

In this paper, first and second type admissible Mannheim partner curves are defined in pseudo-Galilean space G31G_3^1. Moreover, it is proved that the distance between the reciprocal points of both of first and second type admissible Mannheim curves and the torsions of these curves are constant. Furthermore, the relatio…

2010-01-14abs ↗pdf ↗

We produce the first examples of closed, tight contact 3-manifolds which become overtwisted after performing admissible transverse surgeries. Along the way, we clarify the relationship between admissible transverse surgery and Legendrian surgery. We use this clarification to study a new invariant of transverse knots - …

2012-03-14abs ↗pdf ↗

Emergent and unscheduled cardiology admissions from cardiac catheterization laboratory add complexity to the management of Cardiology and in-patient department. In this article, we sought to study the behavior of cardiology admissions from Catheterization laboratory using time series models. Our research involves retro…

2018-12-28abs ↗pdf ↗

The study bounds slopes for Dehn fillings of two-bridge knots with hyperbolic representations.

problem Bounding slopes for Dehn fillings of two-bridge knots with hyperbolic representations.
method Combining the Riley polynomial with Khoi's surgery-slope formula, and analyzing meridian and longitude translation parameters.
result The set of surgery slopes admitting hyperbolic PSL(2,R)\mathrm{PSL}(2,\mathbb{R}) representations is bounded.

The paper solves the Cauchy problem for Friedrichs systems on specific spacetime manifolds.

problem Investigating the Cauchy problem for Friedrichs systems on globally hyperbolic manifolds with timelike boundaries.
method Admissible boundary conditions are imposed to show the existence and uniqueness of strong solutions. For hyperbolic systems, the Cauchy problem is also well-posed in the Hadamard sense.
result Existence and uniqueness of strong solutions for the Cauchy problem are proven under admissible boundary conditions.

Bayesian inference over admissible histories leads to irreversible kinetics.

problem Modeling irreversible processes in systems with uncertain histories.
method A Gibbs-type measure weighted by energy-dissipation action and observation constraints, interpreted as a Bayesian posterior.
result The measure concentrates on maximum-a-posteriori (MAP) histories, recovering classical deterministic evolution.

We give a differential-geometric construction and examples of Calabi-Yau threefolds, at least one of which is {\it{new}}. Ingredients in our construction are {\it admissible pairs}, which were dealt with by Kovalev in \cite{K03} and further studied by Kovalev and Lee in \cite{KL11}. An admissible pair $(\overline{X},D)…

2013-05-01abs ↗pdf ↗

Let $\A$ be a line arrangement in the complex projective plane $\PP^2$. Denote by MM its complement and by $\M$ the set of points in $\A$ with multiplicity at least 3. A rank one local system L\mathcal{L} on MM is admissible if roughly speaking the dimension of the cohomology groups Hm(M,L)H^m(M,\mathcal{L}) can be compu…

2012-07-18abs ↗pdf ↗