Talk:Cantor's diagonal argument

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Cantor was German, the three articles mentioned are in German.

Über eine elementare Frage der Mannigfaltigkeitslehre. Jahresbericht der Deutschen Mathematiker-Vereinigung, Vol I, pp 75ff. The problem with the proof is that is not formalized (and therefore probably easier to understand). A formalized proof was only given in 1910.
Über eine Eigenschaft des Inbegriffes aller reellen algebraischen Zahlen. Journal für die Reine und Angewandte Mathematik Vol 77, pp. 258–262.