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We introduce and study a new class of differential fields in positive characteristic. We call them separably differentially closed fields and demonstrate that they are the differential analogue of separably closed fields. We prove several…

Logic · Mathematics 2025-07-11 Kai Ino , Omar Leon Sanchez

The notion of quantized characters is introduced in our previous paper as a natural quantization of characters in the context of asymptotic representation theory for compact quantum groups. As in the case of ordinary groups, the…

Operator Algebras · Mathematics 2019-08-13 Ryosuke Sato

Positive linear systems on arbitrary time scales are studied. The theory developed in the paper unifies and extends concepts and results known for continuous-time and discrete-time systems. A necessary and sufficient condition for a linear…

Optimization and Control · Mathematics 2012-04-17 Zbigniew Bartosiewicz

In the present work, we study the attractors of iterated function systems (IFSs) on connected and compact metric spaces. We prove that the whole of the phase space of a forward minimal IFS, for which some map admits an attracting fixed…

Dynamical Systems · Mathematics 2023-03-23 Aliasghar Sarizadeh

We identify complete fragments of the Simple Theory of Types with Infinity ($\mathrm{TSTI}$) and Quine's $\mathrm{NF}$ set theory. We show that $\mathrm{TSTI}$ decides every sentence $\phi$ in the language of type theory that is in one of…

Logic · Mathematics 2017-10-18 Anuj Dawar , Thomas Forster , Zachiri McKenzie

This article presents three characterizations of the weak factorization systems on finitely complete categories that interpret intensional dependent type theory with Sigma-, Pi-, and Id-types. The first characterization is that the weak…

Category Theory · Mathematics 2019-06-04 Paige Randall North

The idea of this approach towards proving the consistency of Quine's New Foundations set theory is to go in a completely untyped manner. So no contemplation about types is utilized here. All conceptualization pivots around proving a handful…

Logic · Mathematics 2021-07-27 Zuhair Al-Johar

We give an introduction to the theory of wonderful G-varieties, with many examples when G is simple of type F4. We present results and open problems about these varieties: on their classification, on their isotropy groups, on morphisms…

Algebraic Geometry · Mathematics 2009-03-09 P. Bravi , D. Luna

This paper provides a comprehensive overview of some of the foundational properties of categories enriched over quantaloids, along with several new results. We demonstrate that the category whose objects are quantaloid-enriched categories…

Category Theory · Mathematics 2025-10-14 Javier Gutiérrez García , Ulrich Höhle

This paper presents simple, syntactic strong normalization proofs for the simply-typed lambda-calculus and the polymorphic lambda-calculus (system F) with the full set of logical connectives, and all the permutative reductions. The…

Logic in Computer Science · Computer Science 2008-04-17 Aleksander Wojdyga

Motivated by the problem of determining the structure of integral points on subvarieties of semiabelian varieties defined over finite fields, we prove a quantifier elimination result for certain modules over finite simple extensions of the…

Logic · Mathematics 2007-05-23 Rahim Moosa , Thomas Scanlon

The results in this paper imply that for every number field F and positive integer r, there exists an F-isogeny class of abelian varieties such that r divides the degree of every F-polarization on every abelian variety in the isogeny class.

Algebraic Geometry · Mathematics 2007-05-23 A. Silverberg , Yu. G. Zarhin

We define a simple dependent type theory and prove that its well-formed types correspond exactly to finite inverse categories.

Logic · Mathematics 2017-07-25 Dimitris Tsementzis , Matthew Weaver

We show that the class of inductively factored arrangements is closed under taking localizations. We illustrate the usefulness of this with an application.

Combinatorics · Mathematics 2016-02-24 Tilman Moeller , Gerhard Roehrle

We obtain several results concerning the concept of isotypic structures. Namely we prove that any field of finite transcendence degree over a prime subfield is defined by types; then we construct isotypic but not isomorphic structures with…

Logic · Mathematics 2025-06-18 Pavel Gvozdevsky

We characterize the fixed sets of automorphisms of an arbitrary countable, arithmetically saturated structure.

Logic · Mathematics 2026-05-21 James Schmerl

We provide both a spectral and an internal characterizations of arbitrary I-favorable spaces with respect to co-zero sets. As a corollary we establish that any product of compact I-favorable spaces with respect to co-zero sets is also…

General Topology · Mathematics 2015-03-17 Vesko Valov

We recently introduced the notion of an idempotent system. This linear algebraic object is motivated by the structure of an association scheme. There is a type of idempotent system, said to be symmetric. In the present paper we classify up…

Rings and Algebras · Mathematics 2020-11-03 Kazumasa Nomura , Paul Terwilliger

Let A be a unital separable C*-algebra. We observe that A is type I if and only if the CNT-entropy of every inner automorphism of A is zero.

Operator Algebras · Mathematics 2007-05-23 Nathanial P. Brown

In this article, we prove some factorization results for several classes of polynomials having integer coefficients, which in particular yield several classes of irreducible polynomials. Such classes of polynomials are devised by imposing…

Number Theory · Mathematics 2024-01-17 Jitender Singh , Rishu Garg