The universal sl(2) cohomology via webs and foams
arXiv:0802.2848 · doi:10.1016/j.topol.2009.02.001
Abstract
We construct the universal sl(2)-tangle cohomology using an approach with webs and dotted foams. This theory depends on two parameters, and for the case of links it is a categorification of the unnormalized Jones polynomial of the link.
27 pages, many figures; v2: changes following referee's suggestions, typos corrected