On the Convergence of a Fourier Series and of its Allied Series

W. H. Young
1912 Proceedings of the London Mathematical Society  
THE CONVERGENCE, OP A FOURIER SERIES. 255 an even function; while, if it be an odd function, the odd terms and the even terms have equal limits with opposite signs which coincide if / ( x ) and/(-TT) are both zero.
doi:10.1112/plms/s2-10.1.254 fatcat:mpfzne6775amhekzxbhrpljz3q