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Subgroups of knot groups

โœ Scribed by John Cossey; I. M. S. Dey; Stephen Meskin


Publisher
Springer-Verlag
Year
1971
Tongue
French
Weight
291 KB
Volume
121
Category
Article
ISSN
0025-5874

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A finite subset A of a group is a near subgroup if the number of ordered pairs (x, y) e A 2 with xy ~ A is at most I A [. We show here that if I A I >/5, then A is a near subgroup if and only if A w {g} is a subgroup for some group element g. We also classify the counterexamples if LAI~< 4.

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