Results 1 to 10 of about 251,787 (265)
Notre Dame Journal of Formal Logic, 2012 The aim of the present paper is to provide a robust classi- cation of valid sentences in set theory by means of existence and related notions and, in this way, to capture similarities and dissimilarities among the axioms of set theory. In order to achieve this, precise denitions for the notions of productive and nonproductive assertions, constructive ...
exaly +3 more sources
Regularity and existence of solutions to parabolic equations with nonstandard p(x,t),q(x,t)-growth conditions [PDF]
Opuscula Mathematica, 2023 We study the Cauchy-Dirichlet problem for a class of nonlinear parabolic equations driven by nonstandard \(p(x,t),q(x,t)\)-growth condition. We prove theorems of existence and uniqueness of weak solutions in suitable Orlicz-Sobolev spaces, derive global ...
Hamid El Bahja
doaj +1 more source
On a Riemann–Liouville Type Implicit Coupled System via Generalized Boundary Conditions
Mathematics, 2021 We study a coupled system of implicit differential equations with fractional-order differential boundary conditions and the Riemann–Liouville derivative.
Usman Riaz +5 more
doaj +1 more source
Fractal and Fractional, 2021 This manuscript investigates an extended boundary value problem for a fractional pantograph differential equation with instantaneous impulses under the Caputo proportional fractional derivative with respect to another function.
Bounmy Khaminsou +4 more
doaj +1 more source
On Using Piecewise Fractional Differential Operator to Study a Dynamical System
Axioms, 2023 This research work is devoted to undertaking a dynamical system representing SARS-CoV-19 disease under the concept of piecewise fractional-order derivative using the Caputo concept since long-memory and short-memory terms are not well explained by ...
Shahid Khan +3 more
doaj +1 more source
Fractional Langevin Coupled System with Stieltjes Integral Conditions
Mathematics, 2023 This article outlines the necessary requirements for a coupled system of fractional order boundary value involving the Caputo fractional derivative, including its existence, uniqueness, and various forms of Ulam stability.
Rafia Majeed, Binlin Zhang, Mehboob Alam
doaj +1 more source
The Brezis-Nirenberg problem for mixed local and nonlocal operators
Bruno Pini Mathematical Analysis Seminar, 2023 In this note we present some existence results, in the spirit of the celebrated paper by Brezis and Nirenberg (CPAM, 1983), for a perturbed critical problem driven by a mixed local and nonlocal linear operator. We develop an existence theory, both in the
Stefano Biagi
doaj +1 more source
Study of fractional variable order COVID-19 environmental transformation model
Open Physics, 2023 In this study, we explore the epidemic spread of the coronavirus using the Caputo fractional variable order derivative as variable order derivative provides a natural extension to classical as well as fractional order derivatives.
Zada Mian Bahadur +3 more
doaj +1 more source
Critical analysis of the theory of mental existence from the point of view of Mir Qawamuddin Razi Tehrani [PDF]
تاریخ فلسفه اسلامی, 2023 The theory of mental existence has been seriously discussed in Islamic philosophy and theology since the time of Fakhrazi. Meanwhile, some philosophers have proved this theory and others have denied it.
mehdi asgari, Meytham Khosravi
doaj +1 more source
Inadequacy of Theory of Analogical Unity of Existence [PDF]
حکمت صدرایی, 2019 Since, in accordance with the principles ofanalogical unity of existence doctrine, existence is a real original thing and is gradation in this real original existence; there are levels of existences that are original and real, their existence, in all ...
bagar Hossinlo
doaj +1 more source