Abstract
Recently, the authors interested some new problems on multiplier spaces of Lorentz’ almost convergence and fλ-convergence as a generalization of almost convergence. fλ-convergence is firstly introduced by Karakuş and Başar, and used for some new characterizations of completeness and barrelledness of the spaces through weakly unconditionally Cauchy series in a normed space X and its continuous dual X*. In the present paper, we deal with fλ-convergence to have some inclusion relations between the vector valued spaces obtained from this type convergence and corresponding classical sequence spaces, and to give new characterizations of some classical properties like completeness, reflexivity, Schur property and Grothendieck property of normed spaces. By the way, we give a characterization of finite-dimensional normed spaces.
( Communicated by Gregor Dolinar )
Acknowledgement
The authors have also benefited much from the constructive report of the anonymous referee. So, they are thankful for his/her valuable comments on the first draft of this paper which improved the presentation and readability.
References
[1] Aizpuru, A.—Armario, R.—Pérez-Fernández, F. J.: Almost summability and unconditionally Cauchy series, Bull. Belg. Math. Soc. Simon Stevin 15 (2008), 635–644.10.36045/bbms/1225893944Search in Google Scholar
[2] Aizpuru, A.—Armario, R.—García-Pacheco, F. J.—Pérez-Fernández, F. J.: Banach limits and uniform almost summability, J. Math. Anal. Appl. 379 (2011), 82–90.10.1016/j.jmaa.2010.12.034Search in Google Scholar
[3] Aizpuru, A.—Armario, R.—García-Pacheco, F. J.—Pérez-Fernández, F. J.: Vector-valued almost convergence and classical properties in normed spaces, Proc. Indian Acad. Sci. Math. Sci 124 (1) (2014), 93–108.10.1007/s12044-013-0160-5Search in Google Scholar
[4] Albiac, F.—Kalton, N. J.: Topics in Banach Space Theory, Springer, New York, 2006.Search in Google Scholar
[5] Banach, S.: Théorie des Opérations Linéaires, Chelsea Publ., New York, 1978.Search in Google Scholar
[6] Başar, F.: Summability Theory and its Applications, 2nd ed., CRC Press/Taylor & Francis Group, Boca Raton • London • New York, 2022.10.1201/9781003294153Search in Google Scholar
[7] Başar, F.: Survey on the domain of the matrix lambda in the normed and paranormed sequence spaces, Commun. Fac. Sci. Univ. Ankara, Ser. A1 Math. Stat. 62(1) (2013), 45–59.10.1501/Commua1_0000000685Search in Google Scholar
[8] Boos, J.: Classical and Modern Methods in Summability, Oxford University Press, New York, 2000.10.1093/oso/9780198501657.001.0001Search in Google Scholar
[9] Day, M. M.: Normed Linear Spaces, Springer-Verlag, Berlin • Heidelberg • New York, 1973.10.1007/978-3-662-09000-8Search in Google Scholar
[10] Diestel, J.: Sequences and Series in Banach Spaces, Springer-Verlag, New York, 1984.10.1007/978-1-4612-5200-9Search in Google Scholar
[11] Giles, J. R.: Introduction to the Analysis of Normed Linear spaces, Cambridge University Press, 2000.10.1017/CBO9781139168465Search in Google Scholar
[12] James, R. C.: Characterizations of reflexivity, Studia Math. 23 (1964), 205–216.10.4064/sm-23-3-205-216Search in Google Scholar
[13] Kama, R.: Spaces of vector sequences defined by the f-statistical convergence and some characterizations of normed spaces, Rev. R. Acad. Cienc. Exactas Fís. Nat. Ser. A Mat. RACSAM 114 (2020), Art. No. 74.10.1007/s13398-020-00806-6Search in Google Scholar
[14] Karakuş, M.: On generalized quasi-convex bounded sequences, AIP Conference Proceedings 1759 (2016), 020065.10.1063/1.4959679Search in Google Scholar
[15] Karakuş, M.: On certain vector valued multiplier spaces and series of operators, J. Math. Anal. 10(2) (2019), 1–11.Search in Google Scholar
[16] Karakuş, M.—Başar, F.: A generalization of almost convergence, completeness of some normed spaces with $wuC series and a version of Orlicz-Pettis theorem, Rev. R. Acad. Cienc. Exactas Fís. Nat. Ser. A Mat. RACSAM 113(4) (2019), 3461–3475.10.1007/s13398-019-00701-9Search in Google Scholar
[17] Karakuş, M.—Başar, F.: Operator valued series, almost summability of vector valued multipliers and (weak) compactness of summing operator, J. Math. Anal. Appl. 484(1) (2020), Art. ID 123651.10.1016/j.jmaa.2019.123651Search in Google Scholar
[18] Karakuş, M.—Başar, F.: Vector valued multiplier spaces of fλ-summability, completeness through c0(X)-multiplier convergence and continuity and compactness of summing operators, Rev. R. Acad. Cienc. Exactas Fís. Nat. Ser. A Mat. RACSAM 114 (2020), Art. No. 169.10.1007/s13398-020-00898-0Search in Google Scholar
[19] Lorentz, G. G.: A contribution to the theory of divergent sequences, Acta Math. 80 (1948), 167–190.10.1007/BF02393648Search in Google Scholar
[20] Móricz, F.: On Λ-strong convergence of numerical sequences and Fourier series, Acta Math. Hungar. 54 (3–4) (1989), 319–327.10.1007/BF01952063Search in Google Scholar
[21] Mursaleen, M.: Applied Summability Methods. Springer Briefs, 2014.10.1007/978-3-319-04609-9Search in Google Scholar
[22] Mursaleen, M.—Noman, A. K.: On the spaces of λ-convergent and bounded sequences, Thai J. Math. 8(2) (2010), 311–329.Search in Google Scholar
[23] Wilansky, A.: Summability through Functional Analysis. North-Holland Mathematics Studies 85, Amsterdam • New York • Oxford, 1984.Search in Google Scholar
[24] Yeşilkayagil, M.—Başar, F.: Spaces of Aλ-almost null and Aλ-almost convergent sequences, J. Egyptian Math. Soc. 23 (2015), 119–126.10.1016/j.joems.2014.01.013Search in Google Scholar
© 2022 Mathematical Institute Slovak Academy of Sciences
Articles in the same Issue
- Prof. RNDr. Július korbaš, CSC. passed away
- Kalmbach measurability In d0-algebras
- Quantifiers on L-algebras
- Ideals of functions with compact support in the integer-valued case
- An algebraic study of the logic S5’(BL)
- Triangular numbers and generalized fibonacci polynomial
- A general matrix series inversion pair and associated polynomials
- Quantum ostrowski type inequalities for pre-invex functions
- Hermite-Hadamard type inequalities for interval-valued fractional integrals with respect to another function
- Approximating families for lattice outer measures on unsharp quantum logics
- On a generalized Lamé-Navier system in ℝ3
- Coercive and noncoercive elliptic problems with variable exponent Laplacian under Robin boundary conditions
- On some classical properties of normed spaces via generalized vector valued almost convergence
- Fan-Hemicontinuity for the gradient of the norm in Hilbert space
- Solvability of mixed problems for heat equations with two nonlocal conditions
- The global harnack estimates for a nonlinear heat equation with potential under finsler-geometric flow
- A note on set-star-K-Menger spaces
- A bivariate extension of the Omega distribution for two-dimensional proportional data
- Bernstein polynomials based iterative method for solving fractional integral equations
- The symmetric 4-Player gambler’s problem with unequal initial stakes
- Enveloping action: Convergence spaces
Articles in the same Issue
- Prof. RNDr. Július korbaš, CSC. passed away
- Kalmbach measurability In d0-algebras
- Quantifiers on L-algebras
- Ideals of functions with compact support in the integer-valued case
- An algebraic study of the logic S5’(BL)
- Triangular numbers and generalized fibonacci polynomial
- A general matrix series inversion pair and associated polynomials
- Quantum ostrowski type inequalities for pre-invex functions
- Hermite-Hadamard type inequalities for interval-valued fractional integrals with respect to another function
- Approximating families for lattice outer measures on unsharp quantum logics
- On a generalized Lamé-Navier system in ℝ3
- Coercive and noncoercive elliptic problems with variable exponent Laplacian under Robin boundary conditions
- On some classical properties of normed spaces via generalized vector valued almost convergence
- Fan-Hemicontinuity for the gradient of the norm in Hilbert space
- Solvability of mixed problems for heat equations with two nonlocal conditions
- The global harnack estimates for a nonlinear heat equation with potential under finsler-geometric flow
- A note on set-star-K-Menger spaces
- A bivariate extension of the Omega distribution for two-dimensional proportional data
- Bernstein polynomials based iterative method for solving fractional integral equations
- The symmetric 4-Player gambler’s problem with unequal initial stakes
- Enveloping action: Convergence spaces