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Forms equivalent to curvatures.

Horacio Porta, Lázaro Recht (1986)

Revista Matemática Iberoamericana

The 2-forms, Ω and Ω' on a manifold M with values in vector bundles ξ --> M and ξ' --> M are equivalent if there exist smooth fibered-linear mapsξ --> ξ' and W: ξ --> ξ' with Ω' = UΩ and Ω = WΩ'. It is shown that an ordinary 2-form equivalent to the curvature of a linear connection has locally a non-vanishing integrating factor at each point in the interior of the set rank (ω) = 2 or in the set rank (ω) > 2. Under favorable conditions the same holds at points where...

Forte souplesse intersystolique de variétés fermées et de polyèdres

Ivan K. Babenko (2002)

Annales de l’institut Fourier

La systole k -dimensionnelle d’une variété riemannienne de dimension n a été introduite par M. Berger en 1972. Le problème de la souplesse intersystolique (ou ( k , n - k ) -souplesse) d’une variété M est l’étude de la borne supérieure du produit de deux systoles de dimensions complémentaires k et n - k si on change la métrique sur M dans la classe des métriques de volume 1 . La souplesse intersystolique de M signifie que cette borne supérieure est égale à . Quelques résultats particuliers dans cette direction ont...

Fractal-classic interpolants

M. A. Navascués, M. V. Sebastián (2009)

Banach Center Publications

The methodology of fractal interpolation is very useful for processing experimental signals in order to extract their characteristics of complexity. We go further and prove that the Iterated Function System involved may also be used to obtain new approximants that are close to classical ones. In this work a classical function and a fractal function are combined to construct a new interpolant. The fractal function is first defined as a perturbation of a classical mapping. The additional condition...

Fractional Derivatives in Spaces of Generalized Functions

Stojanović, Mirjana (2011)

Fractional Calculus and Applied Analysis

MSC 2010: 26A33, 46Fxx, 58C05 Dedicated to 80-th birthday of Prof. Rudolf GorenfloWe generalize the two forms of the fractional derivatives (in Riemann-Liouville and Caputo sense) to spaces of generalized functions using appropriate techniques such as the multiplication of absolutely continuous function by the Heaviside function, and the analytical continuation. As an application, we give the two forms of the fractional derivatives of discontinuous functions in spaces of distributions.

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