Carl Severin Wigert

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

$\underset{n\to \mathrm{\infty }}{\mathrm{lim\; sup}}\frac{\log d(n)}{\log n/\log \log n}=\log 2.$