Brunnian Braids on Surfaces

Symmetric ideals in group rings and simplicial homotopy

“…Recall that, for a given pointed simplicial set K, the Milnor F (K)-construction [11] is the simplicial group with F (K) n = F (K n \ * ), where F (−) is the free group functor. Consider the simplicial circle S 1 = ∆[1]/∂∆ [1]:…”