Jakob Nielsen

*Jakob Nielsen* was a Danish mathematician and one of the pioneers of the combinatorial group theory. Nielsen-Schreier theorem, HNN-extensions, Nielsen–Thurston classification, Nielsen fixed point theorem, Nielsen invariant, Fenchel-Nielson coordinates? on Teichmüller space and Nielsen’s method of small cancellations were named after him.

category: people

Revised on February 22, 2013 19:56:56
by Zoran Škoda
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