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History
Louis J. Mordell
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Louis Joel Mordell was an American-born British mathematician, known for pioneering research in number theory. He was born in Philadelphia, United States, in a Jewish family of Lithuanian extraction.
Louis Mordell in Nice, 1970.
Louis Mordell in Nice, 1970.
Ramanujan tau function
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The Ramanujan tau function, studied by Ramanujan, is the function  :\mathbb {N} \rightarrow \mathbb {Z} } defined by the following identity:
Values of |τ(n)| for n < 16,000 with a logarithmic scale. The blue line picks only the values of n that are multiples of 121.
Values of |τ(n)| for n < 16,000 with a logarithmic scale. The blue line picks only the values of n that are multiples of 121.