6.23 (1978)
SolvedA braid $K$ of the braid group $B_{n+1}$ is said to be smooth if removing any of the threads in $K$ transforms $K$ into a braid that is equal to 1 in $B_n$. It is known that smooth braids form a free subgroup. Describe generators of this subgroup.
Progress
They are described in (D. L. Johnson, Math. Proc. Camb. Philos. Soc., 92 (1982), 425–427).
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