# Search results

Applied Mathematics and Computation > 2015 > 265 > Complete > 893-902

Econometrica > 91 > 2 > 709 - 736

Mathematical Methods in the Applied Sciences > 45 > 12 > 7555 - 7575

Mathematical Methods in the Applied Sciences > 45 > 6 > 3295 - 3304

Demonstratio Mathematica > 2021 > Vol. 54, nr 1 > 335--358

Mathematical Methods in the Applied Sciences > 44 > 10 > 8345 - 8362

Mathematical Methods in the Applied Sciences > 44 > 9 > 7747 - 7755

*k*‐step solvers for equations involving operators on Banach spaces. Their convergence is estimated by adopting hypotheses on high‐order derivatives which are not even in these iterative solvers. In addition, no computable error bounds or information on the uniqueness of the solution based on Lipschitz‐type functions are given. Moreover, the choice of the initial guess is like...

Mathematical Methods in the Applied Sciences > 44 > 8 > 6601 - 6611

Mathematical Methods in the Applied Sciences > 44 > 8 > 6389 - 6405

Mathematical Methods in the Applied Sciences > 44 > 6 > 5021 - 5039

Commentationes Mathematicae > 2020 > Vol. 60, No. 1/2 > 37--63

_{1},…, x

_{n}) ∈ E

^{n}is called a norming point of T ∈ L(

^{n}E) if ∥x

_{1}∥ = ⋯ = ∥x

_{n}∥ = 1 and ∣T(x

_{1},…, x

_{n})∣ = ∥T∥, where L(

^{n}E) denotes the space of all continuous n-linear forms on E. For T ∈ L(

^{n}E), we define Norm (T) = {(x

_{1},…, x

_{n}) ∈ E

^{n}: (x

_{1},…, x

_{n}) is a norming point of T}. Norm (T) is called the norming set of T. We classify Norm (T) for every T ∈ L(

^{2}l

^{2}

_{∞}).

Journal of Fixed Point Theory and Applications > 2020 > 22 > 1 > 1-15

Journal of Fixed Point Theory and Applications > 2020 > 22 > 1 > 1-18

*G*for which the Fourier and Fourier–Stieltjes–Banach...

Mediterranean Journal of Mathematics > 2019 > 16 > 6 > 1-26

Mathematische Nachrichten > 292 > 9 > 2028 - 2031

Lobachevskii Journal of Mathematics > 2019 > 40 > 8 > 1132-1136

*h*

_{∞}(

*ϕ*)

*, h*

_{0}(

*ϕ*) and

*h*

^{1}(

*ψ*) functions harmonic in the unit ball

*B*⊂ ℝ

^{n}. These spaces depend on weight functions

*ϕ, ψ*. We prove that if

*ϕ*and

*ψ*form a normal pair, then

*h*

^{1}(

*ψ*)

***∼

*h*

_{∞}(

*ϕ*) and

*h*

_{0}(

*ϕ*)*

*∼ h*

^{1}(

*ψ*).

Mathematical Notes > 2019 > 106 > 1-2 > 183-190

*n*= 2, 3,…, the minimum of the Steiner subratio is found for

*n*-point sets in Banach spaces, and an example of a Banach space is constructed for which this minimum is attained. An example of a Banach space for which the minimum possible Steiner subratio equals 1/2 is also constructed.

Advances in Difference Equations > 2019 > 2019 > 1 > 1-10

*n*-variable mappings that are quartic in each variable. We show that the conditions defining such mappings can be unified in a single functional equation. Furthermore, we apply an alternative fixed point method to prove the Hyers–Ulam stability for the multiquartic functional equations in the normed spaces. We also prove that under some mild conditions, every approximately multiquartic...

Journal of Mathematical Sciences > 2019 > 241 > 4 > 423-429