Carl Severin Wigert

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Carl Severin Wigert (1871–1941) was a Swedish mathematician who introduced Stieltjes–Wigert polynomials and worked on the divisor function, including correctly describing its maximal order of growth. Wigert proved that

\limsup_{n\to\infty}\frac{\log d(n)}{\log n/\log\log n}=\log2.

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