Smoothness of the sum of a lacunary trigonometric series
1965 ◽
Vol 41
(7)
◽
pp. 503-506
◽
2001 ◽
Vol 332
(8)
◽
pp. 685-690
◽
1959 ◽
Vol 91
(3)
◽
pp. 444-444
1968 ◽
Vol 20
(3)
◽
pp. 289-295
◽