‎"WEIERSTRASS, KARL.‎
‎Über einen Functionentheoretischen Satz des Herrn G. Mittag-Leffler. (And same author:) Zur Funktionenlehre.‎

‎Berlin, Akaemie der Wissenschaften, 1880. Uncut in orig. printed wrappers. In ""Monatsbericht der Königlich Preussischen Akademie der Wissenschaften zu Berlin."", August 1880, pp. 719-43. Weierstrass' papers: pp. 707-717 and 719-43.‎

Reference : 39158

‎Both papers first edition. In ""Zur Funktionenlehre"" Weierstrass continues his polemic with Riemann's ideas. Here it is on the topic of the very concept of an analytic function, where Weierstrass placed power series as the starting point, in opposition to Riemann's idea.‎