''Ueber die Anzahl der Primzahlen unter einer gegebenen Grösse'' -- in English, "On the Number of Primes Less Than a Given Magnitude" (1859). The [[Riemann hypothesis]], which is the greatest unsolved problem in mathematics today, is in this paper. | ''Ueber die Anzahl der Primzahlen unter einer gegebenen Grösse'' -- in English, "On the Number of Primes Less Than a Given Magnitude" (1859). The [[Riemann hypothesis]], which is the greatest unsolved problem in mathematics today, is in this paper. |