DETERMINING PARAMETERS OF CONFORMAL MAPPINGS FROM THE UPPER HALF-PLANE ONTO STRAIGHT-LINE PERIODIC POLYGONS WITH DOUBLE SYMMETRY AND ONTO CIRCULAR PERIODIC POLYGONS

Author(s):  
Kolesnikov I. A. ◽  
Author(s):  
Г.П. Селиверстова

Работа посвящена задаче наилучшего восстановления реше- ния задачи Дирихле в пространстве квадратично суммируемых функций на прямой в верхней полуплоскости, параллельной оси абсцисс, по следующей информации о граничной функции: гра- ничная функция принадлежит некоторому соболевскому про- странству функций, а ее преобразование Фурье известно при- ближенное на конечном отрезке, симметричном относительно нуля. Построен оптимальный метод восстановления и найдено точное значение погрешности оптимального восстановления. The work is devoted to the problem of the best recovery solution- the Dirichlet problem in the space of quadratically summable functions on a straight line in the upper half plane parallel to the axis abscissa, on the following information on the boundary function: gra- personal function belongs to some Sobolev Pro- the wandering of functions, and its Fourier transform is known in- near on a finite segment, symmetric with respect to zero's. The optimal recovery method was constructed and found the exact error value of the optimal recovery.


2014 ◽  
Vol 57 (2) ◽  
pp. 381-389
Author(s):  
Adrian Łydka

AbstractWe study analytic properties function m(z, E), which is defined on the upper half-plane as an integral from the shifted L-function of an elliptic curve. We show that m(z, E) analytically continues to a meromorphic function on the whole complex plane and satisfies certain functional equation. Moreover, we give explicit formula for m(z, E) in the strip |ℑz| < 2π.


1983 ◽  
Vol 20 (1) ◽  
pp. 47-54 ◽  
Author(s):  
V. Silvestri ◽  
C. Tabib

The exact distributions of gravity stresses are obtained within slopes of finite height inclined at various angles, −β (β = π/2, π/3, π/4, π/6, and π/8), to the horizontal. The solutions are obtained by application of the theory of a complex variable. In homogeneous, isotropic, and linearly elastic slopes under plane strain conditions, the gravity stresses are independent of Young's modulus and are a function of (a) the coordinates, (b) the height, (c) the inclination angle, (d) Poisson's ratio or the coefficient of earth pressure at rest, and (e) the volumetric weight. Conformal applications that transform the planes of the various slopes studied onto the upper half-plane are analytically obtained. These solutions are also represented graphically.


2004 ◽  
Vol 376 ◽  
pp. 45-67 ◽  
Author(s):  
Pedro J. Freitas ◽  
Shmuel Friedland
Keyword(s):  

2008 ◽  
Vol 60 (5) ◽  
pp. 975-1000 ◽  
Author(s):  
Florin P. Boca

AbstractWe associate with the Farey tessellation of the upper half-plane an AF algebra encoding the “cutting sequences” that define vertical geodesics. The Effros–Shen AF algebras arise as quotients of . Using the path algebra model for AF algebras we construct, for each τ ∈ ( 0, ¼], projections (En) in such that EnEn±1En ≤ τ En.


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