doubleSigma {braids} | R Documentation |
Generator \sigma_{s,t}
in the Birman-Ko-Lee new
presentation. It twists the strands s
and t
while going over
all other strands (for t=s+1
, this is \sigma_s
).
doubleSigma(n, s, t)
n |
number of strands, integer |
s , t |
indices of two strands, |
A braid
object.
doubleSigma(5, 1, 3)