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

${\displaystyle \limsup _{n\to \infty }{\frac {\log d(n)}{\log n/\log \log n}}=\log 2.}$

• "Sur quelques fonctions arithmétiques". Acta Mathematica. 37 (1): 113–140. 1914. doi:10.1007/bf02401831.
• "Sur la série de lambert et son application à la théorie des nombres". Acta Mathematica. 41 (1): 197–218. 1916. doi:10.1007/bf02422944.

• Matematisk forskning under Stockholms högskolas första decennier (in Swedish), archived from the original on 2012-04-21, retrieved 2011-08-26

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