Zygmund, Antoni On the preservation of classes of functions. (English) Zbl 0092.28802 J. Math. Mech. 8, 889-895 (1959); Correction. Ibid. 9, 663 (1960). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 13 Documents Keywords:approximation and series expansion × Cite Format Result Cite Review PDF