A Letter from Madras

Srinivasa Ramanujan taught himself mathematics from one book of results with the proofs stripped out, failed college twice, and in 1913 sent nine pages of theorems to G. H. Hardy. Count partitions against the Hardy-Ramanujan formula, add terms to his series for pi and watch the digits lock in, and sweep the cubes to find 1729. Episode 10 of the Great Scientists series.

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