28 results on '"David Békollé"'
Search Results
2. Mathematical Modelling and Optimal Control of Anthracnose
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David Fotsa, Elvis Houpa, David Bekolle, Christopher Thron, and Michel Ndoumbe
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Anthracnose modelling, nonlinear systems, optimal control ,Biology (General) ,QH301-705.5 ,Mathematics ,QA1-939 - Abstract
In this paper we propose two nonlinear models for the control of anthracnose disease. The first one is an ordinary differential equation (ODE) model which represents the whithin host evolution of the disease. The second model includes spatial diffusion of the disease in a bounded domain Ω. We show well formulation of those models checking existence of solutions for given initial conditions and positive invariance of positive cone. Considering a quadratic cost functional and applying maximum principle we construct a feedback optimal control for the EDO model which is evaluated through numerical simulations with scientific software Scilab®. For the diffusion model we establish under some conditions existence of unique optimal control with respect to a generalized version of cost functional mentioned before. We also provide a characterization for existing optimal control. Finally we discuss a family of nonlinear controlled systems.
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- 2014
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3. Convolutions in µ-pseudo almost periodic and µ-pseudo almost automorphic function spaces and applications to solve Integral equations
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Khalil Ezzinbi, Fritz Mbounja Béssémè, Samir Fatajou, Duplex Elvis Houpa Danga, and David Békollé
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Statistics and Probability ,µ-ergodic ,Numerical Analysis ,Pure mathematics ,integral equations ,µ-pseudo almost periodic functions ,evolution equations ,Applied Mathematics ,37a30 ,reaction-diffusion systems ,µ-pseudo almost automorphic functions ,34c27 ,Automorphic function ,Integral equation ,35b15 ,measure theory ,34k14 ,partial functional differential equations ,35k57 ,QA1-939 ,Analysis ,Mathematics - Abstract
The aim of this work is to give sufficient conditions ensuring that the space PAP(, X, µ) of µ-pseudo almost periodic functions and the space PAA(, X, µ) of µ-pseudo almost automorphic functions are invariant by the convolution product f = k * f, k ∈ L 1(). These results establish sufficient assumptions on k and the measure µ. As a consequence, we investigate the existence and uniqueness of µ-pseudo almost periodic solutions and µ-pseudo almost automorphic solutions for some abstract integral equations, evolution equations and partial functional differential equations.
- Published
- 2020
4. Atomic decomposition and weak factorization for Bergman–Orlicz spaces
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David Békollé, Aline Bonami, and Edgar Tchoundja
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Unit sphere ,Bloch space ,Mathematics::Functional Analysis ,Pure mathematics ,Mathematics::Complex Variables ,General Mathematics ,010102 general mathematics ,Regular polygon ,Holomorphic function ,Space (mathematics) ,01 natural sciences ,010101 applied mathematics ,Atomic decomposition ,Factorization ,Growth function ,0101 mathematics ,Mathematics - Abstract
For $\mathbb B^n$ the unit ball of $\mathbb C^n$, we consider Bergman-Orlicz spaces of holomorphic functions in $L^\Phi_\alpha(\mathbb B^n)$, which are generalizations of classical Bergman spaces. We obtain atomic decomposition for functions in the Bergman-Orlicz space $\mathcal A^\Phi_\alpha (\mathbb B^n)$ where $\Phi$ is either convex or concave growth function. We then prove weak factorization theorems involving the Bloch space and a Bergman-Orlicz space and also weak factorization theorems involving two Bergman-Orlicz spaces.
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- 2020
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5. Estimation and Optimal Control of the Multiscale Dynamics of Covid-19: A Case Study From Cameroon
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Vivient Corneille Kamla, Duplex Elvis Houpa-Danga, Jean-Claude Kamgang, Stéphane Yanick Tchoumi, Yannick Kouakep-Tchaptchie, Samuel Bowong-Tsakou, David Békollé, and David Jaurès Fotsa-Mbogne
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Coronavirus disease 2019 (COVID-19) ,Estimation of parameter ,49J15 ,49M37 ,Population ,Aerospace Engineering ,Ocean Engineering ,34D05 ,Time of extinction ,Upper and lower bounds ,Stability (probability) ,34D20 ,34D23 ,34D45 ,Combinatorics ,Convergence (routing) ,92D30 ,Sensitivity (control systems) ,Electrical and Electronic Engineering ,education ,49K40 ,Mathematics ,education.field_of_study ,Original Paper ,SARS-CoV-2 ,Applied Mathematics ,Mechanical Engineering ,Multi-scale modeling ,Order (ring theory) ,Stability analysis ,90C31 ,Optimal control ,92C60 ,Control and Systems Engineering ,Sensitivity analysis - Abstract
This work aims at a better understanding and the optimal control of the spread of the new severe acute respiratory corona virus 2 (SARS-CoV-2). A multi-scale model giving insights on the virus population dynamics, the transmission process and the infection mechanism is proposed first. Indeed, there are human to human virus transmission, human to environment virus transmission, environment to human virus transmission and self-infection by susceptible individuals. The global stability of the disease-free equilibrium is shown when a given threshold \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\mathcal {T}}_{0} $$\end{document}T0 is less or equal to 1 and the basic reproduction number \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathcal {R}}_{0} $$\end{document}R0 is calculated. A convergence index \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\mathcal {T}}_{1} $$\end{document}T1 is also defined in order to estimate the speed at which the disease extincts and an upper bound to the time of infectious extinction is given. The existence of the endemic equilibrium is conditional and its description is provided. Using Partial Rank Correlation Coefficient with a three levels fractional experimental design, the sensitivity of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\mathcal {R}}_{0} $$\end{document}R0, \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\mathcal {T}}_{0} $$\end{document}T0 and \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {\mathcal {T}}_{1}$$\end{document}T1 to control parameters is evaluated. Following this study, the most significant parameter is the probability of wearing mask followed by the probability of mobility and the disinfection rate. According to a functional cost taking into account economic impacts of SARS-CoV-2, optimal fighting strategies are determined and discussed. The study is applied to real and available data from Cameroon with a model fitting. After several simulations, social distancing and the disinfection frequency appear as the main elements of the optimal control strategy against SARS-CoV-2.
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- 2021
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6. Litte Hankel Operators Between Vector-Valued Bergman Spaces on the Unit Ball
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Hugues Olivier Defo, Brett D. Wick, David Békollé, and Edgar Tchoundja
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Unit sphere ,Mathematics::Functional Analysis ,Algebra and Number Theory ,Open unit ,Hankel operator ,010102 general mathematics ,Banach space ,Compact operator ,01 natural sciences ,Bounded operator ,Combinatorics ,Compact space ,0103 physical sciences ,010307 mathematical physics ,Ball (mathematics) ,0101 mathematics ,Analysis ,Mathematics - Abstract
In this paper, we study the boundedness and the compactness of the little Hankel operators $$h_b$$ with operator-valued symbols b between different weighted vector-valued Bergman spaces on the open unit ball $$\mathbb {B}_n$$ in $$\mathbb {C}^n.$$ More precisely, given two complex Banach spaces X, Y, and $$0 < p,q \le 1,$$ we characterize those operator-valued symbols $$b: \mathbb {B}_{n}\rightarrow \mathcal {L}(\overline{X},Y)$$ for which the little Hankel operator $$h_{b}: A^p_{\alpha }(\mathbb {B}_{n},X) \longrightarrow A^q_{\alpha }(\mathbb {B}_{n},Y),$$ is a bounded operator. Also, given two reflexive complex Banach spaces X, Y and $$1< p \le q < \infty ,$$ we characterize those operator-valued symbols $$b: \mathbb {B}_{n}\rightarrow \mathcal {L}(\overline{X},Y)$$ for which the little Hankel operator $$h_{b}: A^p_{\alpha }(\mathbb {B}_{n},X) \longrightarrow A^q_{\alpha }(\mathbb {B}_{n},Y),$$ is a compact operator.
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- 2021
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7. Projections on hardy spaces in the lie ball
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David Békollé
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Mathematics::Functional Analysis ,Pure mathematics ,Mathematics::Complex Variables ,General Mathematics ,Mathematical analysis ,Sigma ,Hardy space ,Omega ,symbols.namesake ,symbols ,Shilov boundary ,Standard probability space ,Invariant measure ,Ball (mathematics) ,Subspace topology ,Mathematics - Abstract
On the Lie ball $\omega$ of $\Bbb C^n$, $n\ge 3$, we prove that for all $p\in [1,\infty)$, $p\ne 2$, the Hardy space $H^p(\omega)$ is an uncomplemented subspace of the Lebesgue space $L^p (\partial_0\omega,d\sigma)$, where $\partial_0\omega$ denotes the Shilov boundary of $\omega$ and $d\sigma$ is a normalized invariant measure on $\partial_0\omega$.
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- 2021
8. Lebesgue mixed norm estimates for Bergman projectors: from tube domains over homogeneous cones to homogeneous Siegel domains of type II
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Cyrille Nana, David Békollé, and Jocelyn Gonessa
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Mathematics::Dynamical Systems ,Conjecture ,Mathematics::Number Theory ,General Mathematics ,Lorentz transformation ,010102 general mathematics ,Mathematical analysis ,Cone (category theory) ,Decoupling (cosmology) ,Computer Science::Computational Geometry ,Lebesgue integration ,01 natural sciences ,32A25, 32M11, 46B70, 46E30 ,Domain (mathematical analysis) ,symbols.namesake ,Mathematics - Classical Analysis and ODEs ,Homogeneous ,0103 physical sciences ,Classical Analysis and ODEs (math.CA) ,FOS: Mathematics ,symbols ,010307 mathematical physics ,0101 mathematics ,Tube (container) ,Mathematics - Abstract
We present a transference principle of Lebesgue mixed norm estimates for Bergman projectors from tube domains over homogeneous cones to homogeneous Siegel domains of type II associated to the same cones. This principle implies improvements of these estimates for homogeneous Siegel domains of type II associated with Lorentz cones, e.g. the Pyateckii-Shapiro Siegel domain of type II., Comment: 33 pages, 6 figures
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- 2018
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9. Nonautonomous partial functional differential equations; existence and regularity
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Khalil Ezzinbi, David Békollé, and Moussa El-Khalil Kpoumiè
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Statistics and Probability ,Numerical Analysis ,nonautonomous equation ,Differential equation ,Applied Mathematics ,Mathematical analysis ,evolution family ,stability conditions ,generalized variation of constants formula ,Stability conditions ,QA1-939 ,compatibility conditions ,Analysis ,mild and strict solutions ,Mathematics - Abstract
The aim of this work is to establish several results on the existence and regularity of solutions for some nondensely nonautonomous partial functional differential equations with finite delay in a Banach space. We assume that the linear part is not necessarily densely defined and generates an evolution family under the conditions introduced by N. Tanaka.We show the local existence of the mild solutions which may blow up at the finite time. Secondly,we give sufficient conditions ensuring the existence of the strict solutions. Finally, we consider a reaction diffusion equation with delay to illustrate the obtained results.
- Published
- 2017
10. The Duren–Carleson Theorem in Tube Domains over Symmetric Cones
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Benoît F. Sehba, Edgar Tchoundja, and David Békollé
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Algebra and Number Theory ,010102 general mathematics ,020206 networking & telecommunications ,02 engineering and technology ,Hardy space ,01 natural sciences ,Omega ,Combinatorics ,symbols.namesake ,Integer ,0202 electrical engineering, electronic engineering, information engineering ,symbols ,Exponent ,Standard probability space ,0101 mathematics ,Tube (container) ,Borel measure ,Analysis ,Mathematics - Abstract
In the setting of tube domains over symmetric cones, we determine a necessary and sufficient condition on a Borel measure \(\mu \) so that the Hardy space \(H^{p}, \ 1\le p < \infty ,\) continuously embeds in the weighted Lebesgue space \(L^q (T_\Omega ,d\mu )\) with a larger exponent. Finally we use this result to characterize multipliers from \(H^{2m}\) to Bergman spaces for every positive integer m.
- Published
- 2016
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11. Periodic Solutions for Some Nondensely Nonautonomous Partial Functional Differential Equations in Fading Memory Spaces
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Moussa El-Khalil Kpoumiè, Khalil Ezzinbi, and David Békollé
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Work (thermodynamics) ,Differential equation ,Applied Mathematics ,010102 general mathematics ,Mathematical analysis ,Banach space ,Fixed point ,01 natural sciences ,010101 applied mathematics ,Stability conditions ,Nonlinear system ,Bounded function ,Reaction–diffusion system ,0101 mathematics ,Analysis ,Mathematics - Abstract
The aim of this work is to study the existence of a periodic solution for some nondensely nonautonomous partial functional differential equations with infinite delay in Banach spaces. We assume that the linear part is not necessarily densely defined and generates an evolution family. We use Massera’s approach (Duke Math 17:457–475, 1950), we prove that the existence of a bounded solution on \(\mathbb {R}^{+}\) implies the existence of an \(\omega \)-periodic solution. In nonlinear case, we use a fixed point for multivalued maps to show the existence of a periodic solution. Finally, we consider a reaction diffusion equation with delay to illustrate the main results of this work.
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- 2016
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12. Atomic decomposition and interpolation via the complex method for mixed norm Bergman spaces on tube domains over symmetric cones
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David Békollé, Cyrille Nana, and Jocelyn Gonessa
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Pure mathematics ,Mixed norm ,Mathematics::Complex Variables ,32A25, 32M11, 46B70, 46E30 ,Theoretical Computer Science ,Atomic decomposition ,Mathematics (miscellaneous) ,Mathematics - Classical Analysis and ODEs ,Decomposition (computer science) ,Classical Analysis and ODEs (math.CA) ,FOS: Mathematics ,Interpolation space ,Tube (container) ,Mathematics ,Interpolation - Abstract
Starting from an adapted Whitney decomposition of tube domains in $\C^n$ over irreducible symmetric cones of $\R^n,$ we prove an atomic decomposition theorem in mixed norm weighted Bergman spaces on these domains. We also characterize the interpolation space via the complex method between two mixed norm weighted Bergman spaces., 27 pages
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- 2017
13. KORÁNYI’S LEMMA FOR HOMOGENEOUS SIEGEL DOMAINS OF TYPE II. APPLICATIONS AND EXTENDED RESULTS
- Author
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Cyrille Nana, Hideyuki Ishi, and David Békollé
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Atomic decomposition ,Pure mathematics ,Bergman space ,Homogeneous ,General Mathematics ,Mathematical analysis ,Ball (mathematics) ,Bergman metric ,Mathematics ,Bergman kernel - Abstract
We show that the modulus of the Bergman kernel $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}B(z, \zeta )$ of a general homogeneous Siegel domain of type II is ‘almost constant’ uniformly with respect to $z$ when $\zeta $ varies inside a Bergman ball. The control is expressed in terms of the Bergman distance. This result was proved by A. Korányi for symmetric Siegel domains of type II. Subsequently, R. R. Coifman and R. Rochberg used it to establish an atomic decomposition theorem and an interpolation theorem by functions in Bergman spaces $A^p$ on these domains. The atomic decomposition theorem and the interpolation theorem are extended here to the general homogeneous case using the same tools. We further extend the range of exponents $p$ via functional analysis using recent estimates.
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- 2014
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14. Littlewood–Paley decompositions related to symmetric cones and Bergman projections in tube domains
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David Békollé, Gustavo Garrigós, Aline Bonami, Fulvio Ricci, Bekolle', D, Bonami, A, Garrigos, G, and Ricci, Fulvio
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Combinatorics ,Mathematics::Functional Analysis ,Conjecture ,Bergman space ,General Mathematics ,Mathematical analysis ,Holomorphic function ,Partition (number theory) ,D'Alembert operator ,Real line ,Natural class ,Omega ,Mathematics - Abstract
Starting from a Whitney decomposition of a symmetric cone $\Omega$, analogous to the dyadic partition $[2^j, 2^{ j + 1})$ of the positive real line, in this paper we develop an adapted Littlewood?Paley theory for functions with spectrum in $\Omega$. In particular, we define a natural class of Besov spaces of such functions, $B^{p, q}_\nu$, where the role of the usual derivation is now played by the generalized wave operator of the cone $\Delta(\frac{\partial}{\partial x})$. We show that $B^{p, q}_\nu$ consists precisely of the distributional boundary values of holomorphic functions in the Bergman space $A^{p, q}_\nu (T_\Omega)$, at least in a 'good range' of indices $1 \leq q 2$. Moreover, we show the equivalence of this problem with the boundedness of Bergman projectors $P_\nu \colon L^{p, q}_\nu \to A^{p, q}_\nu$, for which our result implies a positive answer when $q_{\nu, p}' < q < q_{\nu, p}$. This extends, to general cones, previous work of the authors on the light-cone. Finally, we focus on light-cones and introduce new necessary and sufficient conditions for our conjecture to hold in terms of inequalities related to the cone multiplier problem. In particular, using recent work by Laba and Wolff, we establish the validity of our conjecture for light-cones when $p$ is sufficiently large.
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- 2004
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15. Complex interpolation between two weighted Bergman spaces on tubes over symmetric cones
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Jocelyn Gonessa, Cyrille Nana, and David Békollé
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Combinatorics ,Atomic decomposition ,Cone (topology) ,Bergman space ,Mathematical analysis ,Interpolation space ,Symmetric cone ,General Medicine ,Rank (differential topology) ,Space (mathematics) ,Mathematics ,Interpolation - Abstract
We prove that the complex interpolation space [ A ν p 0 , A ν p 1 ] θ , 0 θ A ν p 0 and A ν p 1 on the tube in C n , n ⩾3, over an irreducible symmetric cone of R n is the weighted Bergman space A ν p with 1/ p =(1− θ )/ p 0 + θ / p 1 . Here, ν > n / r −1 and 1⩽ p 0 p 1 ν /( n / r −1) where r denotes the rank of the cone. We then construct an analytic family of operators and an atomic decomposition of functions, which are related to this interpolation result. To cite this article: D. Bekolle et al., C. R. Acad. Sci. Paris, Ser. I 337 (2003).
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- 2003
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16. Hausdorff-Young inequalities for functions in Bergman spaces on tube domains
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Aline Bonami, David Békollé, Département de Mathématiques Université de Yaoundé 1 = Department of Mathematics [Yaoundé, Cameroon], Université de Yaoundé I, Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Department of Mathematics [Yaoundé], and University of Yaoundé [Cameroun]
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Bergman space ,General Mathematics ,[MATH.MATH-DS]Mathematics [math]/Dynamical Systems [math.DS] ,010102 general mathematics ,0103 physical sciences ,Mathematical analysis ,Hausdorff space ,010307 mathematical physics ,0101 mathematics ,Tube (container) ,01 natural sciences ,Mathematics ,Bergman kernel - Abstract
We prove that the functions of the Bergman spaces Ap on tube domains may be written as Laplace transforms of functions when 1 ≤ p ≤ 2. We give in this context a generalization of the Hausdorff–Young inequality with the exact constant, and deduce from the case p = 2 the expression of the Bergman kernel as a Laplace transform.
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- 1998
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17. Molecular decompositions and interpolation
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Anatole Temgoua Kagou and David Békollé
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Discrete mathematics ,Pure mathematics ,Lemma (mathematics) ,Algebra and Number Theory ,Mathematics::Complex Variables ,Generalization ,Non symmetric ,Symmetric case ,Homogeneous ,Bergman space ,Analysis ,Interpolation ,Mathematics ,Bergman kernel - Abstract
Molecular decompositions for functions in weighted Bergman spaces are extended to two homogeneous, non symmetric Siegel domains of type II, as well as interpolation by functions in weighted Bergman spaces. An ingredient in the proof is a generalization of a lemma due to Koranyi. We also specify the hypotheses in the symmetric case.
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- 1998
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18. Reproducing properties and $L^p$-estimates for Bergman projections in Siegel domains of type II
- Author
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David Békollé and Anatole Temgoua Kagou
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Pure mathematics ,General Mathematics ,Mathematical analysis ,Mathematics - Published
- 1995
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19. Estimates for the Bergman and Szegö projections in two symmetric domains of $ℂ^{n}$
- Author
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Aline Bonami and David Békollé
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Transfer principle ,Bloch space ,symbols.namesake ,Bergman space ,Stability group ,General Mathematics ,Mathematical analysis ,symbols ,Shilov boundary ,Hardy space ,Mathematics ,Bergman kernel - Published
- 1995
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20. Analytic Besov spaces and Hardy-type inequalities in tube domains over symmetric cones
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Benoît F. Sehba, Fulvio Ricci, David Békollé, Gustavo Garrigós, Aline Bonami, Department of Mathematics [Yaoundé], University of Yaoundé [Cameroun], Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Departemento de Matematicas, Universidad Autonoma de Madrid (UAM), Istituto Matematico, Scuola Normale Superiore, Békollé, D, Bonami, A, Garrigós, G, Ricci, Fulvio, Sehba, B., Aline, Bonami, Département de Mathématiques Université de Yaoundé 1 = Department of Mathematics [Yaoundé, Cameroon], and Université de Yaoundé I
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Pure mathematics ,General Mathematics ,Open problem ,Duality (mathematics) ,Mathematics::Classical Analysis and ODEs ,[MATH.MATH-CA]Mathematics [math]/Classical Analysis and ODEs [math.CA] ,Type (model theory) ,01 natural sciences ,Projection (linear algebra) ,0103 physical sciences ,Classical Analysis and ODEs (math.CA) ,FOS: Mathematics ,Complex Variables (math.CV) ,0101 mathematics ,Mathematics ,Bergman kernel ,Bloch space ,Mathematics::Functional Analysis ,Mathematics - Complex Variables ,Mathematics::Complex Variables ,Applied Mathematics ,010102 general mathematics ,Mathematical analysis ,[MATH.MATH-CV]Mathematics [math]/Complex Variables [math.CV] ,[MATH.MATH-CA] Mathematics [math]/Classical Analysis and ODEs [math.CA] ,Mathematics - Classical Analysis and ODEs ,Bergman space ,[MATH.MATH-CV] Mathematics [math]/Complex Variables [math.CV] ,42B35, 32M15 ,Besov space ,010307 mathematical physics - Abstract
We give various equivalent formulations to the (partially) open problem about $L^p$-boundedness of Bergman projections in tubes over cones. Namely, we show that such boundedness is equivalent to the duality identity between Bergman spaces, $A^{p'}=(A^p)^*$, and also to a Hardy type inequality related to the wave operator. We introduce analytic Besov spaces in tubes over cones, for which such Hardy inequalities play an important role. For $p\geq 2$ we identify as a Besov space the range of the Bergman projection acting on $L^p$, and also the dual of $A^{p'}$. For the Bloch space $\SB^\infty$ we give in addition new necessary conditions on the number of derivatives required in its definition.
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- 2010
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21. Boundedness of Bergman projections on tube domains over light cones
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David Békollé, Marco M. Peloso, Fulvio Ricci, Aline Bonami, Bekoll, D, Bonami, A, Peloso, M, Ricci, Fulvio, Département de Mathématiques Université de Yaoundé 1 = Department of Mathematics [Yaoundé, Cameroon], Université de Yaoundé I, Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Dipartimento di Matematica 'Giuseppe Peano' [Torino], Università degli studi di Torino (UNITO), Istituto Matematico, Scuola Normale Superiore, Department of Mathematics [Yaoundé], and University of Yaoundé [Cameroun]
- Subjects
Mathematics::Complex Variables ,Astrophysics::High Energy Astrophysical Phenomena ,General Mathematics ,010102 general mathematics ,Mathematical analysis ,[MATH.MATH-CV]Mathematics [math]/Complex Variables [math.CV] ,[MATH.MATH-CA]Mathematics [math]/Classical Analysis and ODEs [math.CA] ,01 natural sciences ,Omega ,010101 applied mathematics ,Combinatorics ,Projection (relational algebra) ,Light cone ,Domain (ring theory) ,0101 mathematics ,Mathematics - Abstract
Let \(\Gamma\) be the future light cone in \({\Bbb R}^n\), and \(\Omega={\Bbb R}^n +i\Gamma\) be the associated tube domain. We prove that the weighted Bergman projection \(P_\nu\)
- Published
- 2001
22. Bergman spaces with small exponents
- Author
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David Békollé
- Subjects
Pure mathematics ,Bergman space ,General Mathematics ,Mathematics ,Bergman kernel - Published
- 2000
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23. Theory of Bergman Spaces
- Author
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David Békollé
- Subjects
Pure mathematics ,symbols.namesake ,History and Philosophy of Science ,Bergman space ,General Mathematics ,Mathematical analysis ,symbols ,Interpolation space ,Hardy space ,Mathematics ,Bergman kernel - Published
- 2005
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24. The dual of the Bergman space 𝐴¹ in symmetric Siegel domains of type 𝐼𝐼
- Author
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David Békollé
- Subjects
Unit sphere ,Bloch space ,Pure mathematics ,Lebesgue measure ,Bergman space ,Applied Mathematics ,General Mathematics ,Mathematical analysis ,Holomorphic function ,Cayley transform ,Domain (mathematical analysis) ,Bergman kernel ,Mathematics - Abstract
An affirmative answer is given to the following conjecture of R. Coifman and R. Rochberg: in any symmetric Siegel domain of type II, the dual of the Bergman space A 1 {A^1} coincides with the Bloch space of holomorphic functions and can be realized as the Bergman projection of L ∞ {L^\infty } .
- Published
- 1986
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25. The Bergman projection of 𝐿^{∞} in tubes over cones of real, symmetric, positive-definite matrices
- Author
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David Békollé
- Subjects
Combinatorics ,Bloch space ,Projection (mathematics) ,Bergman space ,Applied Mathematics ,General Mathematics ,Mathematical analysis ,Symmetric matrix ,Positive-definite matrix ,Mathematics - Abstract
We determine a defining kernel for the Bergman projection of L ∞ {L^\infty } in tubes over cones of real, symmetric, positive-definite matrices.
- Published
- 1986
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26. Projections sur des Espaces de Fonctions Holomorphes Dans des Domaines Plans
- Author
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David Békollé
- Subjects
General Mathematics ,010102 general mathematics ,0103 physical sciences ,010307 mathematical physics ,0101 mathematics ,01 natural sciences ,Humanities ,Mathematics - Abstract
Soit Ω un domaine de Jordan à bord rectifiable du plan complexe C. Désignons par dλ la mesure de Lebesgue à l'intérieur de Ω, par dσ la mesure de Lebesgue sur le bord ∂Ω de Ω et par φ une représentation conforme de Ω sur le disque unité D du plan complexe.Par définition, la classe de Bergman Ap(Ω), 0 < p ≦ +∞, est le sous-espace de Lp(dλ) formé par les fonctions holomorphes dans Ω et le projecteur de Bergman PΩ de Ω est le projecteur orthogonal de L2(dλ) sur A2(Ω); quel que soit f dans L2(dλ), on a la formule:(1)
- Published
- 1986
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27. Le dual de l'espace des fonctions holomorphes intégrables dans des domaines de Siegel
- Author
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David Békollé
- Subjects
Algebra and Number Theory ,Geometry and Topology ,Humanities ,Mathematics - Published
- 1984
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28. Inégalités à poids pour le projecteur de Bergman dans la boule unité de $C^{n}$
- Author
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David Békollé
- Subjects
General Mathematics ,Humanities ,Mathematics - Published
- 1982
- Full Text
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