A hundred and one years ago, in 1913, the famous British mathematician G. H. Hardy received a letter out of the blue. The Indian (British colonial) stamps and curious handwriting caught his attention, and when he opened it, he was flabbergasted. Its pages were crammed with equations â€“ many of which he had never seen before. There were many kinds of formulas there, and those that first caught his attention had to do with algebraic numbers.Â Hardy was the leading number theorist in the world â€“ ho

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