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Continuity of order-preserving functions

Boris Lavrič (1997)

Commentationes Mathematicae Universitatis Carolinae

Let the spaces 𝐑 m and 𝐑 n be ordered by cones P and Q respectively, let A be a nonempty subset of 𝐑 m , and let f : A 𝐑 n be an order-preserving function. Suppose that P is generating in 𝐑 m , and that Q contains no affine line. Then f is locally bounded on the interior of A , and continuous almost everywhere with respect to the Lebesgue measure on 𝐑 m . If in addition P is a closed halfspace and if A is connected, then f is continuous if and only if the range f ( A ) is connected.

Continuous-, derivative-, and differentiable-restrictions of measurable functions

Jack Brown (1992)

Fundamenta Mathematicae

We review the known facts and establish some new results concerning continuous-restrictions, derivative-restrictions, and differentiable-restrictions of Lebesgue measurable, universally measurable, and Marczewski measurable functions, as well as functions which have the Baire properties in the wide and restricted senses. We also discuss some known examples and present a number of new examples to show that the theorems are sharp.

Continuously differentiable means.

Fujii, Jun Ichi, Fujii, Masatoshi, Miura, Takeshi, Takagi, Hiroyuki, Takahasi, Sin-Ei (2006)

Journal of Inequalities and Applications [electronic only]

Controlled convergence theorems for Henstock-Kurzweil-Pettis integral on m -dimensional compact intervals

Sokol B. Kaliaj, Agron D. Tato, Fatmir D. Gumeni (2012)

Czechoslovak Mathematical Journal

In this paper we use a generalized version of absolute continuity defined by J. Kurzweil, J. Jarník, Equiintegrability and controlled convergence of Perron-type integrable functions, Real Anal. Exch. 17 (1992), 110–139. By applying uniformly this generalized version of absolute continuity to the primitives of the Henstock-Kurzweil-Pettis integrable functions, we obtain controlled convergence theorems for the Henstock-Kurzweil-Pettis integral. First, we present a controlled convergence theorem for...

Convergence of series of dilated functions and spectral norms of GCD matrices

Christoph Aistleitner, István Berkes, Kristian Seip, Michel Weber (2015)

Acta Arithmetica

We establish a connection between the L² norm of sums of dilated functions whose jth Fourier coefficients are ( j - α ) for some α ∈ (1/2,1), and the spectral norms of certain greatest common divisor (GCD) matrices. Utilizing recent bounds for these spectral norms, we obtain sharp conditions for the convergence in L² and for the almost everywhere convergence of series of dilated functions.

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