Proof of Bertrand's postulate (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Proof of Bertrand's postulate" in English language version.

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1books.google.com

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books.google.com (Global: 3^rd place; English: 3^rd place)

Bertrand, Joseph (1845), "Mémoire sur le nombre de valeurs que peut prendre une fonction quand on y permute les lettres qu'elle renferme.", Journal de l'École Royale Polytechnique (in French), 18 (Cahier 30): 123–140.

imsc.res.in (Global: low place; English: low place)

Ramanujan, S. (1919), "A proof of Bertrand's postulate", Journal of the Indian Mathematical Society, 11: 181–182

renyi.hu (Global: low place; English: low place)

users.renyi.hu

Erdős, Pál (1932), "Beweis eines Satzes von Tschebyschef" [Proof of a theorem of Chebyshev] (PDF), Acta Scientarium Mathematicarum (Szeged), 5 (3–4): 194–198, Zbl 004.10103

zbmath.org (Global: 1,923^rd place; English: 1,068^th place)

Erdős, Pál (1932), "Beweis eines Satzes von Tschebyschef" [Proof of a theorem of Chebyshev] (PDF), Acta Scientarium Mathematicarum (Szeged), 5 (3–4): 194–198, Zbl 004.10103