Results 161 to 170 of about 421,577 (266)

Equivalences of Nonlinear Higher Order Fractional Differential Equations With Integral Equations

open access: yesMathematical Methods in the Applied Sciences, Volume 48, Issue 6, Page 6930-6942, April 2025.
ABSTRACT Equivalences of initial value problems (IVPs) of both nonlinear higher order (Riemann–Liouville type) fractional differential equations (FDEs) and Caputo FDEs with the corresponding integral equations are studied in this paper. It is proved that the nonlinearities in the FDEs can be L1$$ {L}^1 $$‐Carathéodory with suitable conditions.
Kunquan Lan
wiley   +1 more source

Foundations of Ghost Stability

open access: yesFortschritte der Physik, Volume 73, Issue 4, April 2025.
Abstract The authors present a new method to analytically prove global stability in ghost‐ridden dynamical systems. The proposal encompasses all prior results and consequentially extends them. In particular, it is shown that stability can follow from a conserved quantity that is unbounded from below, contrary to expectation.
Verónica Errasti Díez   +2 more
wiley   +1 more source

A Note on Some Isomorphic Properties in Projective Tensor Products

open access: yesExtracta Mathematicae, 2017
A Banach space X is sequentially Right (resp. weak sequentially Right) if every Right subset of X* is relatively weakly compact (resp. weakly precompact). A Banach space X has the L-limited (resp.
Ioana Ghenciu
doaj  

Quantitative expansivity for ergodic Zd$\mathbb {Z}^d$‐actions

open access: yesJournal of the London Mathematical Society, Volume 111, Issue 4, April 2025.
Abstract We study expansiveness properties of positive measure subsets of ergodic Zd$\mathbb {Z}^d$‐actions along two different types of structured subsets of Zd$\mathbb {Z}^d$, namely, cyclic subgroups and images of integer polynomials. We prove quantitative expansiveness properties in both cases, strengthening combinatorial results from two distinct ...
Alexander Fish, Sean Skinner
wiley   +1 more source

Differentiation in Banach Spaces [PDF]

open access: yes, 1998
We introduce the concept of differentiability for mappings between Banach spaces, and we derive the elementary rules for differentiation.
openaire   +2 more sources

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