Volume 8 | Number 2 | Year 2014 | Article Id. IJMTT-V8P518 | DOI : https://doi.org/10.14445/22315373/IJMTT-V8P518
The field of approximation theory is so vast that it plays an increasingly important role in applications in pure and applied mathematics. The present study deals with a theorem concerning the degree of approximation of a function f belonging to W (Lr, ξ (t)) (r > 1)-class by using (E, 1) (C, 2) of its Fourier series.
[1] P. Chandra, “Trigonometric approximation of functions in Lp norm”, J. Math. Anal. Appl. Vol. 275 No. 1, 2002, pp. 13-26.
[2] G. Alexits, Convergence problems of orthogonal series, Pergamon Press, London, 1961.
[3] G. H. Hardy, “Divergent series”, first edition, Oxford University Press, 1949, 70.
[4] H. H. Khan, “On degree of approximation of functions belonging to the class Lip(α, p)”, Indian J. Pure Appl. Math, Vol. 5, No. 2, 1974, pp. 132-136.
[5] L. Leindler, “Trigonometric approximation of functions in Lp norm”, J. Math. Anal. Appl., Vol. 302, No. 1, 2005, pp. 129-136.
[6] L. Mc Fadden, “Absolute N¨orlund summability”, Duke Math. J., Vol. 9, 1942, pp. 168-207.
[7] V. N. Mishra, H. H. Khan, I. A. Khan, K. Khatri and L. N. Mishra, “Trigonometric Approximation of signals (functions) belonging to the Lip(ξ(t), r), (r ≥ 1)- class by (E, q)(q > 0)-Means of the conjugate series of its Fourier Series”, Advances in Pure Mathematics, Vol. 3, 2013, pp. 353-358.
[8] H. K. Nigam, “Degree of approximation of a function belonging to Lip(ξ(t), r) class by (E, 1)(C, 2) summability means”, Asian Journal of Fuzzy and Applied Mathematics 1 No. 3, 2013, pp. 61-68.
[9] K. Qureshi, “On the degree of approximation of a periodic function f by almost N¨orlund means”, Tamkang J. Math. 12 No. 1, 1981, pp. 35-38.
[10] K. Qureshi, “On the degree of approximation of a function belonging to the class Lipα”, Indian J. pure Appl. Math. 13 No. 8, 1982, pp. 560-563.
[11] K. Qureshi, H. K. Neha, “A class of functions and their degree of approximation”, Ganita. 41 No. 1, 1990, pp. 37-42.
[12] B. E. Rhaodes, “On the degree of approximation of functions belonging to Lipschitz class by Hausdorff means of its Fourier series”, Tamkang J. Math. 34 no. 3, 2003, pp. 245-247.
[13] B. N. Sahney, D. S. Goel, “On the degree of continuous functions”, Ranchi University, Math. Jour., 4, 1973, pp. 50-53.
[14] A. Zygmund, “Trigonometric series”, 2nd rev. ed., Vol. 1, Cambridge Univ. Press, Cambridge, 1959.
Kusum Sharma, S. S. Malik, "Degree of Approximation of a Function Belongingto W (Lr, ξ (t)) (r > 1)-Class by (E, 1)(C, 2) Product Summabilty Transform," International Journal of Mathematics Trends and Technology (IJMTT), vol. 8, no. 2, pp. 136-146, 2014. Crossref, https://doi.org/10.14445/22315373/IJMTT-V8P518