If f (x) e Lip a (0 < a < 1) and Sn (x), the n-th partial sum of itş Fourier series, then f(x ) - S n (x) = o(l/n), where Ö (h) is a positive increasing function.
Khan, H. H. (1982). A note on a theorem of Izumi. Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics, 31, 124-127. https://doi.org/10.1501/Commua1_0000000128
AMA
Khan HH. A note on a theorem of Izumi. Commun. Fac. Sci. Univ. Ank. Ser. A1 Math. Stat. January 1982;31:124-127. doi:10.1501/Commua1_0000000128
Chicago
Khan, Huzoor H. “A Note on a Theorem of Izumi”. Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics 31, January (January 1982): 124-27. https://doi.org/10.1501/Commua1_0000000128.
EndNote
Khan HH (January 1, 1982) A note on a theorem of Izumi. Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics 31 124–127.
IEEE
H. H. Khan, “A note on a theorem of Izumi”, Commun. Fac. Sci. Univ. Ank. Ser. A1 Math. Stat., vol. 31, pp. 124–127, 1982, doi: 10.1501/Commua1_0000000128.
ISNAD
Khan, Huzoor H. “A Note on a Theorem of Izumi”. Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics 31 (January 1982), 124-127. https://doi.org/10.1501/Commua1_0000000128.
JAMA
Khan HH. A note on a theorem of Izumi. Commun. Fac. Sci. Univ. Ank. Ser. A1 Math. Stat. 1982;31:124–127.
MLA
Khan, Huzoor H. “A Note on a Theorem of Izumi”. Communications Faculty of Sciences University of Ankara Series A1 Mathematics and Statistics, vol. 31, 1982, pp. 124-7, doi:10.1501/Commua1_0000000128.
Vancouver
Khan HH. A note on a theorem of Izumi. Commun. Fac. Sci. Univ. Ank. Ser. A1 Math. Stat. 1982;31:124-7.