Zobrazeno 1 - 10
of 411
pro vyhledávání: '"Alves, Marcelo P."'
We employ the curve shortening flow to establish three new results on the dynamics of geodesic flows of closed Riemannian surfaces. The first one is the stability, under $C^0$-small perturbations of the Riemannian metric, of certain flat links of clo
Externí odkaz:
http://arxiv.org/abs/2408.11938
In this work we introduce partial and global actions of inverse categories on posets in two variants, fibred actions and actions by symmetries. We study in detail actions of an inverse category $\mathcal{C}$ on specific subposets of the poset of fini
Externí odkaz:
http://arxiv.org/abs/2405.13212
We study stability properties of the topological entropy of Reeb flows on contact 3-manifolds with respect to the C^0-distance on the space of contact forms. Our main results show that a C^\infty-generic contact form on a closed co-oriented contact 3
Externí odkaz:
http://arxiv.org/abs/2311.12001
In this work we investigate partial actions of a Hopf algebra H on nonunital algebras and the associated partial smash products. We show that our partial actions correspond to nonunital algebras in the category of partial representations of H. The ce
Externí odkaz:
http://arxiv.org/abs/2210.15403
In this work, the notion of a quantum inverse semigroup is introduced as a linearized generalization of inverse semigroups. Beyond the algebra of an inverse semigroup, which is the natural example of a quantum inverse semigroup, several other example
Externí odkaz:
http://arxiv.org/abs/2206.11999
Autor:
Alves, Marcelo R. R., Meiwes, Matthias
In this article we show that the braid type of a set of $1$-periodic orbits of a non-degenerate Hamiltonian diffeomorphism on a surface is stable under perturbations which are sufficiently small with respect to the Hofer metric $d_{\rm Hofer}$. We ca
Externí odkaz:
http://arxiv.org/abs/2112.11351
In this paper, we study the regularity of topological entropy, as a function on the space of Riemannian metrics endowed with the $C^0$ topology. We establish several instances of entropy robustness (persistence of entropy non-vanishing after small $C
Externí odkaz:
http://arxiv.org/abs/2109.03917
Publikováno v:
Sel. Math. New Ser. 29, 67 (2023)
On every closed contact manifold there exist contact forms with volume one whose Reeb flows have arbitrarily small topological entropy. In contrast, for many closed manifolds there is a uniform positive lower bound for the topological entropy of (not
Externí odkaz:
http://arxiv.org/abs/2103.01144
Autor:
Sperandei, Sandro, Bastos, Leonardo S., Ribeiro-Alves, Marcelo, Reis, Arianne, Bastos, Francisco I.
Objective: To investigate the impact of different logistic regression estimators applied to RDS samples obtained by simulation and real data. Methods: Four simulated populations were created combining different connectivity models, levels of clusteri
Externí odkaz:
http://arxiv.org/abs/2101.04253
We study partial homology and cohomology from ring theoretic point of view via the partial group algebra $\mathbb{K}_{par}G$. In particular, we link the partial homology and cohomology of a group $G$ with coefficients in an irreducible (resp. indecom
Externí odkaz:
http://arxiv.org/abs/2006.10173