Ueber gewisse Determinanten
Ueber independente Darstellung der höheren Differentialquotienten
Ueber Integration und Differentiation infinitärer Relationen
Ueber mehrfache Integrale, welche durch eine Transformation der Variabeln ihre Gestalt nicht ändern.
Ueber Systeme von Functionen reeller Variabeln.
Ueber trigonometrische Reihen
Ulam Stabilities for Partial Impulsive Fractional Differential Equations
In this paper we investigate the existence of solutions for the initial value problems (IVP for short), for a class of implicit impulsive hyperbolic differential equations by using the lower and upper solutions method combined with Schauder’s fixed point theorem.
Ultrarigid tangents of sub-Riemannian nilpotent groups
We show that the tangent cone at the identity is not a complete quasiconformal invariant for sub-Riemannian nilpotent groups. Namely, we show that there exists a nilpotent Lie group equipped with left invariant sub-Riemannian metric that is not locally quasiconformally equivalent to its tangent cone at the identity. In particular, such spaces are not locally bi-Lipschitz homeomorphic. The result is based on the study of Carnot groups that are rigid in the sense that their only quasiconformal maps...
Uncountable γ-sets under axiom
We formulate a Covering Property Axiom , which holds in the iterated perfect set model, and show that it implies the existence of uncountable strong γ-sets in ℝ (which are strongly meager) as well as uncountable γ-sets in ℝ which are not strongly meager. These sets must be of cardinality ω₁ < , since every γ-set is universally null, while implies that every universally null has cardinality less than = ω₂. We also show that implies the existence of a partition of ℝ into ω₁ null compact sets....
Une inégalité intégrale concernant certaines fonctions Log-concaves
Une méthodologie du calcul hardware des fonctions élémentaires
Une propriété extrémale de la suite de Thue-Morse en rapport avec les cascades de Feigenbaum
Uniform attractors in sup-norm for semi linear parabolic problem and application to the robust stability theory
In this paper we establish the existence of the uniform attractor for a semi linear parabolic problem with bounded non autonomous disturbances in the phase space of continuous functions. We applied obtained results to prove the asymptotic gain property with respect to the global attractor of the undisturbed system.
Uniform limits of Darboux functions on the Euclidean plane
Uniformly bounded composition operators in the banach space of bounded (p, k)-variation in the sense of Riesz-Popoviciu
We prove that if the composition operator F generated by a function f: [a, b] × ℝ → ℝ maps the space of bounded (p, k)-variation in the sense of Riesz-Popoviciu, p ≥ 1, k an integer, denoted by RV(p,k)[a, b], into itself and is uniformly bounded then RV(p,k)[a, b] satisfies the Matkowski condition.
Unique solvability of fractional functional differential equation on the basis of Vallée-Poussin theorem
We propose explicit tests of unique solvability of two-point and focal boundary value problems for fractional functional differential equations with Riemann-Liouville derivative.
Uniqueness of regular similarity functions
Untersuchungen über die unendlich oft oscillirenden und unstetigen Functionen. (Abdruck aus dem Gratulationsprogramm der Tübinger Universität vom 6. März 1870.)
Upper and lower bounds of solutions for fractional integral equations.
Upper and lower Lebesgue-Stieltjes integrals