Results 71 to 80 of about 11,069 (184)
Some fixed point theorems for discontinuous mappings [PDF]
This paper provides a fixed point theorem à la Schauder, where the mappings considered are possibly discontinuous. Our main result generalizes and unifies several well-known results.Schauder fixed point theorem, Brouwer fixed point theorem, discontinuity.
Philippe Bich
core
Persistence of fixed points under rigid perturbations of maps
, 2014 Let $f:S^1\times [0,1]\to S^1\times [0,1]$ be a real-analytic annulus diffeomorphism which is homotopic to the identity map and preserves an area form.
Addas-Zanata, Salvador +1 more
core +1 more source
Brain and Behavior, Volume 15, Issue 10, October 2025.Cortical surface analyses of former preterm‐born children with (PT hCMV+) and without (PT hCMV−) early postnatal human Cytomegalovirus (hCMV) infection at ∼13 years of age. Note the strong effect of prematurity when compared to full‐term‐born children (FT, top), but the independent and even more widespread effect of HCMV infection (bottom).
Meike Müller +6 more
wiley +1 more source
Brouwer's Fixed Point Theorem with Isolated Fixed Points and His Fan Theorem
ISRN Computational Mathematics, 2012 We show that Brouwer’s fixed point theorem with isolated fixed points is equivalent to Brouwer’s fan theorem.
openaire +1 more source
Advancing causal inference in ecology: Pathways for biodiversity change detection and attribution
Methods in Ecology and Evolution, Volume 16, Issue 10, Page 2276-2304, October 2025.Abstract Understanding the causes of biodiversity change is essential for addressing environmental challenges. While causal attribution has advanced in other fields, ecologists remain cautious about causal claims or misinterpret predictive models as causal.
Franziska Schrodt +18 more
wiley +1 more source
A note on matrices mapping a positive vector onto its element-wise inverse
, 2017 For any primitive matrix $M\in\mathbb{R}^{n\times n}$ with positive diagonal entries, we prove the existence and uniqueness of a positive vector $\mathbf{x}=(x_1,\dots,x_n)^t$ such that $M\mathbf{x}=(\frac{1}{x_1},\dots,\frac{1}{x_n})^t$.
Labbé, Sébastien
core +1 more source
International Economic Review, Volume 66, Issue 4, Page 1693-1712, October 2025.ABSTRACT We examine the feedback loop between shortages and consumer stockpiling. The expectation of shortages induces consumers to stockpile, which amplifies the shortages they experience, which further encourages stockpiling. We show that, when aggregate supply is insufficient to meet aggregate demand and prices cannot adjust to clear the market ...
Tilman Klumpp, Xuejuan Su
wiley +1 more source
Approximate Fixed Point Theorems [PDF]
Under some weakenings of the condition of the well-known fixed point theorems of Brouwer, Kakutani and Banach the existence of approximate fixed points turns out to be still guaranteed.
Brânzei, R., Tijs, S.H., Torre, A.
core +1 more source
Journal of Applied Econometrics, Volume 40, Issue 6, Page 608-626, September/October 2025.ABSTRACT This paper introduces a generalized model of peer effects for binary outcomes, based on a network game that accounts for strategic complementarity (influence of the number of peers that select the same action) and conformity to social norms (penalizing deviations from the average peers' action).
Mathieu Lambotte
wiley +1 more source
Global stability of a vaccination model with immigration
Electronic Journal of Differential Equations, 2015 We study an SVIR model of disease transmission with immigration into all four classes. Vaccinated individuals may only receive partial immunity to the disease, giving a leaky vaccine.
Sarah Henshaw, C. Connell McCluskey
doaj