On Lebesgue summability for double series

M. J. Kohn
1976 Proceedings of the American Mathematical Society  
In [2] a two dimensional analogue of Lebesgue's theorem on differentiation of formally integrated trigonometric series was established. Here we show that a stronger analogue holds.
doi:10.1090/s0002-9939-1976-0415197-3 fatcat:plkztrv7tnb75ogjyihr6rknqy