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Aplicaciones elementales de la ecuación funcional de Cauchy: f ( x + y ) = f ( x ) + f ( y )
Published 2007-06-01Get full text
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Trigonometric approximation of functions f ( x , y ) $f(x,y)$ of generalized Lipschitz class by double Hausdorff matrix summability method
Published 2020-12-01“…Abstract In this paper, we establish a new estimate for the degree of approximation of functions f ( x , y ) $f(x,y)$ belonging to the generalized Lipschitz class L i p ( ( ξ 1 , ξ 2 ) ; r ) $Lip ((\xi _{1}, \xi _{2} );r )$ , r ≥ 1 $r \geq 1$ , by double Hausdorff matrix summability means of double Fourier series. …”
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An iterative method for the solution of the equation \(x=f(x,...,x)\)
Published 1981-02-01Get full text
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An iterative method for the solution of the equation \(x=f(x,...,x)\)
Published 1981-02-01Get full text
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Cálculo de los elementos matriciales: < j | f (x) | i>
Published 1991-07-01“…En la mecánica cuántica es de importancia el cálculo de elementos matriciales de la forma < j | f(X) | i > donde |i > y | j > son vectores que pertenecen a una base completa ortogonal { | k > } y f (X) es un operador que representa un observable. …”
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AN THE ECUATION Re [(x-a)f(x)]=0, fєS
Published 2012-05-01“…Let S be the class of functions f(z)=z+a2z2…, f(0)=0, f′(0)=1 which are regular and univalent in theunit disk |z|<1.For 0≤x≤a≤1 we consider the equationRe [(x-a)f(x)]=0, fєS. and Re [(x3-a3)f(x)]=0. (1)Denote φ(x)=Re [(x-a)f(x)]. …”
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On the nonlinear matrix equation $ X^{s}+A^{H}F(X)A = Q $
Published 2023-05-01“…In this paper, the nonlinear matrix equation $ X^{s}+A^{H}F(X)A = Q $ are discussed, where operator $ F $ are defined in the set of all $ n\times n $ positive semi-definite matrices, and $ Q $ is a positive definite matrix. …”
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Fiber preserving transformations and the equation $y'''=f(x,y,y',y'')$
Published 2005-03-01Get full text
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Families of third, fourth and fifth order extended Nystrom methods for \(y'''=f( x,y)\)
Published 1991-08-01Get full text
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