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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.

169,341 papers · 148 categories

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2975938901,186 · Jun 202019922001200920182026
48 results for admissible methods

The paper introduces admissible hierarchical clustering methods for asymmetric networks.

problem Characterizing and implementing hierarchical clustering methods for asymmetric networks.
method The paper characterizes admissible hierarchical clustering methods and proposes algorithms for their implementation.
result The paper describes three families of intermediate methods for admissible hierarchical clustering of asymmetric networks.

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 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.

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}.

This paper introduces hierarchical quasi-clustering methods, a generalization of hierarchical clustering for asymmetric networks where the output structure preserves the asymmetry of the input data. We show that this output structure is equivalent to a finite quasi-ultrametric space and study admissibility with respect…

2014-04-17abs ↗pdf ↗

Study on existence of weighted extremal Kähler metrics on projective bundles.

problem Existence of weighted extremal Kähler metrics on projective bundles.
method General existence result for weighted extremal metrics on admissible projective bundles.
result Existence of conformally Kähler, Einstein-Maxwell metrics of complex dimension m>2m>2.

Develops a method to define admissible rewards for robust policy evaluation in RL.

problem Defining a reward function for robust off-policy evaluation in RL with limited data.
method Identifies an admissible set of reward functions ensuring policies are close to past behavior and can be evaluated with high confidence.
result Demonstrates the approach on synthetic and real-world domains, including a critical care application.

This work proposes a student-teacher network for predicting hospital admission locations.

problem Accurate prediction of hospital admission locations to optimize resource allocation.
method Reinforcement learning approach where a teacher network selects data batches for a student network.
result The approach outperforms state-of-the-art methods on tabular data and image recognition.

A novel method learns word embeddings and topics using Wasserstein distance.

problem Learning word embeddings and topics from text data.
method Distilled Wasserstein learning framework for joint word embedding and topic modeling.
result Superior performance on disease network construction, mortality prediction, and procedure recommendation.

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 ↗

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.

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.

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 ↗

We give a differential-geometric construction of Calabi-Yau fourfolds by the `doubling' method, which was introduced in \cite{DY14} to construct Calabi-Yau threefolds. We also give examples of Calabi-Yau fourfolds from toric Fano fourfolds. Ingredients in our construction are \emph{admissible pairs}, which were first d…

2015-02-01abs ↗pdf ↗

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.

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 ↗

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 explicitly test if the reliability of credit ratings depends on the total number of admissible states. We analyse open access credit rating data and show that the effect of the number of states in the dynamical properties of ratings change with time, thus giving supportive evidence that the ideal number of admissibl…

2014-09-09abs ↗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 ↗

Method reconstructs potential from partial boundary measurements on admissible manifolds.

problem Reconstructing potential from partial data on admissible manifolds.
method Develops a method using the geodesic ray transform and complex geometrical optics solutions.
result Reconstructs potential locally and globally under certain conditions.

Researchers compare two methods for handlebody constructions, finding they are related with a 'background charge'.

problem Comparing two methods for handlebody constructions in finite ribbon categories.
method Admissible skein module construction vs. ansular functor construction.
result An isomorphism between the two constructions is proven, with a 'background charge' that becomes trivial in the unimodular case.

Differentiable sorting and rank normalization are incompatible, with specific conditions for admissibility.

problem Incompatibility between differentiable sorting and rank normalization.
method Formalized admissibility through monotone invariance, batch independence, and rank-space stability conditions.
result Different gap-sensitive and batchwise relaxations of rank normalization violate the conditions for admissibility.