IPM Calendar 
Tuesday 13 November 2018   Today  
Events for day: Wednesday 14 November 2018    
           14:00 - 15:00     Lecture
Tangles -vs- Trees

School
MATHEMATICS

The topic of these talks is the structural theory of sparse graphs. More specifically, we study the interplay between highly cohesive substructures, which we figuratively refer to as `tangles', and decompositions over a (graph-theoretic) tree, which we simply call `trees'. At this point, we intentionally leave the meaning of these terms undefined and rely solely on the connotations they may carry.
We are primarily interested in situations in which a certain pair of a tangle and a tree cannot coexist: the existence of the specified substructure makes a decomposition of the desired kind impossible and vice versa. For example, tree-dec ...