Yasutaka Nakanishi asked in 1981 whether a 3-move is an unknotting operation. In Kirby's problem list, this question is called The Montesinos-Nakanishi 3-move conjecture. We define the nth Burnside group of a link and use the 3rd Burnside group to answer Nakanishi's question; ie, we show that some links cannot be reduced to trivial links by 3-moves.
CITATION STYLE
Da̧bkowski, M. K., & Przytycki, J. H. (2002). Burnside obstructions to the Montesinos-Nakanishi 3-move conjecture. Geometry and Topology, 6, 355–360. https://doi.org/10.2140/gt.2002.6.355
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