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Mathematics Preprint PDF DOI

Counterexamples to an Extremal Conjecture for Random Cycle-Factors

Rishikesh Gajjala ยท 2026

Christoph, Dragani\'{c}, Gir\~{a}o, Hurley, Michel, and M\"{u}yesser conjectured that, when $d\mid n$, the expected number of cycles in a uniformly random cycle-factor of a directed $d$-regular graph โ€ฆ

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Earth & Environmental Sciences Preprint PDF DOI

Connecting Meteorite Spectra to Lunar Surface Composition Using Hyperspectral Imaging and Machine Learning

Fatemeh Fazel Hesar, Mojtaba Raouf, Amirmohammad Chegeni, Peyman Soltani, Bernard Foing, Elias Chatzitheodoridis, Michiel J. A. de Dood, Fons J. Verbeek ยท 2026

We present an innovative, cost-effective framework integrating laboratory Hyperspectral Imaging (HSI) of the Bechar010 Lunar meteorite with ground-based lunar HSI and supervised Machine Learning(ML) tโ€ฆ

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Physics Preprint PDF DOI

The Bayesian view of DESI DR2: Evidence and tension in a combined analysis with CMB and supernovae across cosmological models

Dily Duan Yi Ong, David Yallup, Will Handley ยท 2026

We apply the unimpeded framework to perform a fully Bayesian reanalysis of the DESI DR2 data, using nested sampling with PolyChord to compute evidences for $\Lambda$CDM and seven extensions across comโ€ฆ

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AI & Data Science Preprint PDF DOI

DRetHTR: Linear-Time Decoder-Only Retentive Network for Handwritten Text Recognition

Changhun Kim, Martin Mayr, Thomas Gorges, Fei Wu, Mathias Seuret, Andreas Maier, Vincent Christlein ยท 2026

State-of-the-art handwritten text recognition (HTR) systems commonly use Transformers, whose growing key-value (KV) cache makes decoding slow and memory-intensive. We introduce DRetHTR, a decoder-onlyโ€ฆ

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Mathematics Preprint PDF DOI

Hodge theory for twisted log-differential forms

Junyan Cao ยท 2026

In this survey, we review recent developments in extending Hodge theory to differential forms with values in bundles equipped with singular metrics, based on joint work with Ya Deng, Christopher D. Haโ€ฆ

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Mathematics Preprint PDF DOI

Growth estimate for the number of crossing limit cycles in planar piecewise polynomial vector fields

Luana Ascoli, Douglas D. Novaes ยท 2026

Motivated by the classical Hilbert's Sixteenth Problem, we extend some main developments obtained for Hilbert's number in the polynomial setting to the piecewise polynomial context. Specifically, we sโ€ฆ

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Physics Preprint PDF DOI

Analytical Solutions of the Minimal Nonlinear Equation for the Yaw Response of Tail Fins and Wind Vanes

Mohamed M. Hammam, David H. Wood ยท 2026

Analytical solutions for the yaw response of tail fins for small wind turbines, and wind vanes for wind direction measurement, are derived for any planform and any release angle $\gamma_0$. This extenโ€ฆ

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Earth & Environmental Sciences Preprint PDF DOI

Where does the simplified Stellar Contamination Model fail in Exoplanet Transmission Spectroscopy?

Viktor Y. D. Sumida, Raissa Estrela, Mark Swain, Adriana Valio ยท 2026

Stellar photospheric heterogeneities (e.g., starspots, faculae) distort the stellar spectrum in transit and imprint wavelength-dependent biases on the planet-to-star radius ratio (Transit Light Sourceโ€ฆ

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Mathematics Preprint PDF DOI

Mathematics in the liturgical books of the Catholic Church: phases of the ecclesiastical moon

Henryk Fuks ยท 2026

We use contemporary mathematical notation to describe the method for determining the age of the ecclesiastical moon as mandated by pope Gregory XIII and elaborated in the book of Christopher Clavius \โ€ฆ

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AI & Data Science Preprint PDF DOI

Machine Learning: Progress and Prospects

Alexander Gammerman ยท 2025

This Inaugural Lecture was given at Royal Holloway University of London in 1996. It covers an introduction to machine learning and describes various theoretical advances and practical projects in the โ€ฆ

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Mathematics Preprint PDF DOI

On the number of sum-free subsets of the square grid

Anubhab Ghosal ยท 2025

Generalising the Cameron--Erd\H{o}s conjecture to two dimensions, Elsholtz and Rackham conjectured that the number of sum-free subsets of $[n]^2$ is $2^{0.6n^2+O(n)}$. We prove their conjecture.โ€ฆ

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Earth & Environmental Sciences Preprint PDF DOI

Global impacts of organic aerosol acidity on sulfate and cloud formation

Gargi Sengupta, Kunal Ghosh, Prithvi R. Jallu, N{o}nne L. Prisle ยท 2025

Organic aerosols (OA) comprise a major fraction of atmospheric particulate matter and frequently contain acidic species, yet their contribution to overall aerosol acidity has not been explicitly consiโ€ฆ

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AI & Data Science Preprint PDF DOI

Re-Examining the Statistical Methodology and Onomastic Claims of Gregor and Blais' Argument from Name Popularity

Jason Wilson, Luuk van de Weghe ยท 2025

In 2024 Gregor and Blais published a JSNT article using two different statistical methods to conclude, contra Bauckham (2017), that selected Apocryphal texts and the Babylonian Talmud "do not correspoโ€ฆ

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Mathematics Preprint PDF DOI

Normally hyperbolic limit tori near monodromic singularities in 3D polynomial vector fields

Lucas Queiroz Arakaki, Luiz F. S. Gouveia, Douglas D. Novaes ยท 2025

We investigate the maximal number $N_h(m)$ of normally hyperbolic limit tori in three-dimensional polynomial vector fields of degree $m$, which extends the classical notion of Hilbert numbers to higheโ€ฆ

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Mathematics Preprint PDF DOI

The Hamilton cycle space of random graphs

Dan Hefetz, Michael Krivelevich ยท 2025

The cycle space of a graph $G$, denoted $C(G)$, is a vector space over ${\mathbb F}_2$, spanned by all incidence vectors of edge-sets of cycles of $G$. If $G$ has $n$ vertices, then $C_n(G)$ denotes tโ€ฆ

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Mathematics Preprint PDF DOI

Isomorphisms of unit distance graphs of layers

Arthur Igorevich Bikeev ยท 2025

For any $\varepsilon \in (0,+\infty)$, consider the metric spaces $\mathbb{R} \times [0,\varepsilon]$ in the Euclidean plane named layers or strips. B. Baslaugh in 1998 found the minimal width $\varepโ€ฆ

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Mathematics Preprint PDF DOI

Dirac-type condition for Hamilton-generated graphs

Xinmin Hou, Zhi Yin ยท 2025

The cycle space $\mathcal{C}(G)$ of a graph $G$ is defined as the linear space spanned by all cycles in $G$. For an integer $k\ge 3$, let $\mathcal{C}_k (G)$ denote the subspace of $\mathcal{C}(G)$ geโ€ฆ

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Mathematics Preprint PDF DOI

Intersecting hypergraphs with large cover number

Matija Bucic, Vanshika Jain, Varun Sivashankar ยท 2025

In their famous 1974 paper introducing the local lemma, Erd\H{o}s and Lov\'asz posed a question-later referred by Erd\H{o}s as one of his three favorite open problems: What is the minimum number of edโ€ฆ

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Physics Preprint PDF DOI

Revisiting Christoph Scheiner's Sunspot Records: a New Perspective on Solar Activity of the Early Telescopic Era

V.M.S. Carrasco, A. Munoz-Jaramillo, M.C. Gallego, J.M. Vaquero ยท 2025

Christoph Scheiner was one of the most outstanding astronomers in the history of the sunspot observations. His book, Rosa Ursina, is the reference work regarding the study of the earliest sunspot recoโ€ฆ

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AI & Data Science Preprint PDF DOI

HTR-JAND: Handwritten Text Recognition with Joint Attention Network and Knowledge Distillation

Mohammed Hamdan, Abderrahmane Rahiche, Mohamed Cheriet ยท 2024

Despite significant advances in deep learning, current Handwritten Text Recognition (HTR) systems struggle with the inherent complexity of historical documents, including diverse writing styles, degraโ€ฆ

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