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The dispersion of gas exhalations and the problem of distribution of new sources on a dry hilly surface

Dien Hien Tran — 1986

Aplikace matematiky

The process of gas exhalations in the lower layer of the atmosphere and the problem of distribution of new sources of exhalations in a hilly terrain are studied. Among other, the following assumptions are introduced: (1) the terrain is a hilly one, (2) the exhalations enter a chemical reaction with the atmosphere, (3) the process is stationary, (4) the vector of wind velocity satisfies the continuity equation. The mathematical formulation of the problem then is a mixed boundary value problem for...

Integral representations for solutions of exponential Gauß-Manin systems

Marco HienCéline Roucairol — 2008

Bulletin de la Société Mathématique de France

Let f , g : U 𝔸 1 be two regular functions from the smooth affine complex variety U to the affine line. The associated exponential Gauß-Manin systems on the affine line are defined to be the cohomology sheaves of the direct image of the exponential differential system 𝒪 U e g with respect to f . We prove that its holomorphic solutions admit representations in terms of period integrals over topological chains with possibly closed support and with rapid decay condition.

Equivalence of multi-norms

The theory of multi-norms was developed by H. G. Dales and M. E. Polyakov in a memoir that was published in Dissertationes Mathematicae. In that memoir, the notion of ’equivalence’ of multi-norms was defined. In the present memoir, we make a systematic study of when various pairs of multi-norms are mutually equivalent. In particular, we study when (p,q)-multi-norms defined on spaces L r ( Ω ) are equivalent, resolving most cases; we have stronger results in the case where r = 2. We also show that the standard...

A primal-dual integral method in global optimization

Jens HichertArmin HoffmannHuan Xoang PhúRüdiger Reinhardt — 2000

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

Using the Fenchel conjugate F c of Phú’s Volume function F of a given essentially bounded measurable function f defined on the bounded box D ⊂ Rⁿ, the integral method of Chew and Zheng for global optimization is modified to a superlinearly convergent method with respect to the level sequence. Numerical results are given for low dimensional functions with a strict global essential supremum.

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