Results 21 to 30 of about 6,651,187 (298)

Omega-inconsistency without cuts and nonstandard models

, 2016
This paper concerns the relationship between transitivity of entailment, omega-inconsistency and nonstandard models of arithmetic. First, it provides a cut-free sequent calculus for non-transitive logic of truth STT based on Robinson Arithmetic and shows
Andreas Fjellstad
core   +3 more sources

Exotic symmetries, duality, and fractons in 2+1-dimensional quantum field theory

SciPost Physics, 2021
We discuss nonstandard continuum quantum field theories in 2+1 dimensions. They exhibit exotic global symmetries, a subtle spectrum of charged excitations, and dualities similar to dualities of systems in 1+1 dimensions.
Nathan Seiberg, Shu-Heng Shao
doaj   +1 more source

Chaotic numerical instabilities arising in the transition from differential to difference nonlinear equations

Discrete Dynamics in Nature and Society, 2000
For computational purposes, a numerical algorithm maps a differential equation into an often complex difference equation whose structure and stability depends on the scheme used.
Alicia Serfaty de Markus
doaj   +1 more source

Qualitatively Stable Nonstandard Finite Difference Scheme for Numerical Solution of the Nonlinear Black–Scholes Equation

Journal of Mathematics, 2021
In this paper, we use a numerical method for solving the nonlinear Black–Scholes partial differential equation of the European option under transaction costs, which is based on the nonstandard discretization of the spatial derivatives.
Mohammad Mehdizadeh Khalsaraei, Ali Shokri, Zahra Mohammadnia, Hamid Mohammad Sedighi   +3 more
doaj   +1 more source

Integrable cosmological models with an additional scalar field

European Physical Journal C: Particles and Fields, 2021
We consider modified gravity cosmological models that can be transformed into two-field chiral cosmological models by the conformal metric transformation.
Vsevolod R. Ivanov, Sergey Yu. Vernov
doaj   +1 more source

Racial disparities in receipt of standard chemoradiation in anal squamous cell carcinoma, an analysis of the National Cancer Database

Cancer Medicine, 2021
Background Standard treatment for locally advanced anal squamous cell carcinoma (SCC) consists of concurrent chemoradiation. We evaluated whether racial differences exist in the receipt of standard treatment and its association with survival.
Shelly X. Bian, Dennis H. Chen, Eugene Lin   +2 more
doaj   +1 more source

A New Numerical Scheme for Time Fractional Diffusive SEAIR Model with Non-Linear Incidence Rate: An Application to Computational Biology

Fractal and Fractional, 2022
In this paper, we propose a modified fractional diffusive SEAIR epidemic model with a nonlinear incidence rate. A constructed model of fractional partial differential equations (PDEs) is more general than the corresponding model of fractional ordinary ...
Yasir Nawaz, Muhammad Shoaib Arif, Wasfi Shatanawi   +2 more
doaj   +1 more source

Non-standard neutrino interactions in light mediator models at reactor experiments

Journal of High Energy Physics, 2023
Compared to other neutrino sources, the huge anti-neutrino fluxes at nuclear reactor based experiments empower us to derive stronger bounds on non-standard interactions of neutrinos with electrons mediated by light scalar/vector mediators.
Bhaskar Dutta, Sumit Ghosh, Tianjun Li, Adrian Thompson, Ankur Verma   +4 more
doaj   +1 more source

A new crossover dynamics mathematical model of monkeypox disease based on fractional differential equations and the Ψ-Caputo derivative: Numerical treatments

Alexandria Engineering Journal
A novel crossover model for monkeypox disease that incorporates Ψ-Caputo fractional derivatives is presented here, where we use a simple nonstandard kernel function Ψ(t).
N.H. Sweilam, S.M. Al-Mekhlafi, W.S. Abdel Kareem, G. Alqurishi   +3 more
doaj   +1 more source

A Nonstandard Dynamically Consistent Numerical Scheme Applied to Obesity Dynamics

Journal of Applied Mathematics, 2008
The obesity epidemic is considered a health concern of paramount importance in modern society. In this work, a nonstandard finite difference scheme has been developed with the aim to solve numerically a mathematical model for obesity population dynamics.
Rafael J. Villanueva, Abraham J. Arenas, Gilberto González-Parra   +2 more
doaj   +1 more source