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Ramanujan’s Proof of Bertrand’s Postulate

Jaban Meher and M. Ram Murty
The American Mathematical Monthly
Vol. 120, No. 7 (August–September 2013), pp. 650-653
DOI: 10.4169/amer.math.monthly.120.07.650
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Page Count: 4
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Ramanujan’s Proof of Bertrand’s Postulate
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Abstract We present Ramanujan’s proof of Bertrand’s postulate and in the process, eliminate his use of Stirling’s formula. The revised proof is elegant and elementary so as to be accessible to a wider audience.

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