Asymptotic mean of digits of the QsQ_s-representation of the fractional part of a real number and related problems of fractal geometry and fractal analysis

This paper introduces the concept of the asymptotic mean of digits in the generalized QsQ_s-representation of real numbers and investigates the topological, metric, and fractal properties of sets defined by the existence or specific values of these means, while also exploring their connections to digit frequencies and fractal geometry.

M. V. Pratsiovytyi, S. O. Klymchuk2026-03-06🔢 math

Topological, metric and fractal properties of the set of real numbers with a given asymptotic mean of digits in their $4$-adic representation in the case when the digit frequencies exist

This paper investigates the topological, metric, and fractal properties of the set of real numbers whose 4-adic digits possess existing frequencies and a specific asymptotic mean, providing an algorithm for constructing such points and establishing conditions for their Lebesgue measure and Hausdorff dimension.

M. V. Pratsiovytyi, S. O. Klymchuk2026-03-06🔢 math

The small finitistic dimensions of commutative rings, III

This paper establishes a characterization of the small finitistic dimension of a commutative ring RR in terms of the vanishing of Ext groups for finitely generated ideals, proving that fPD(R)d(R)\leq d if and only if the vanishing of ExtRi(R/I,R)Ext_R^i(R/I,R) for i=0,,di=0,\dots,d implies its vanishing for all i0i\geq 0, and applies this result to derive the inequality fPD(R)FP-IdRR(R)\leq \text{FP-}Id_RR and analyze various classes of rings such as (n,d)(n,d)-rings and DW-rings.

Xiaolei Zhang2026-03-06🔢 math

Dictionary Based Pattern Entropy for Causal Direction Discovery

This paper introduces Dictionary Based Pattern Entropy (DPE), a novel framework that combines Algorithmic and Shannon Information Theories to infer causal directions and identify driving subpatterns in symbolic sequences by quantifying how compact, rule-based patterns in a cause systematically reduce uncertainty in an effect, demonstrating robust performance across diverse synthetic and real-world datasets.

Harikrishnan N B, Shubham Bhilare, Aditi Kathpalia + 1 more2026-03-06🔢 math

The Unitary Conjugation Groupoid of a Type I C*-Algebra: Topology, Fell Continuity, and the Canonical Diagonal Embedding

This paper introduces a canonical Polish groupoid constructed from the unitary group and dual space of a separable unital C*-algebra, demonstrating that for Type I algebras, the associated reduced groupoid C*-algebra is Morita equivalent to the original algebra tensored with compact operators and admits a canonical diagonal embedding that characterizes commutativity.

Shih-Yu Chang2026-03-06🔢 math