In 1905 Lebesgue gave a deep discussion of the various conditions Lipschitz and Jordan had used in order to ensure that a function f(x) is the sum of its Fourier series.
Sa 1905 Lebesgue ibinigay ng malalim ng talakayan ng iba't-ibang mga kundisyon Lipschitz at Jordan ay ginagamit upang masiguro na ang isang function f (x) ay ang kabuuan ng kanyang Fourier series.