| Braid indices in a class of closed braids |
2010 |
270 |
A long-standing problem in knot theory concerns the additivity of crossing numbers of links under the connected sum operation. It is conjectured that if L1 and L2 are links, then Cr(L1#L2) = Cr(L1) + Cr(L2), but so far this has been proved only for... |