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SUMMARY:On the elusivity of softwired clusters - Kelk\, SM (CWI)
DTSTART:20110621T092000Z
DTEND:20110621T094000Z
UID:TALK31810@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Rooted phylogenetic networks are often used to represent confl
 icting phylogenetic signals. One approach requires us to construct a phylo
 genetic network such that\, for each cluster (i.e. clade) that is present 
 in at least one input gene tree\, at least one tree embedded in the networ
 k contains that cluster. This is often called the softwired cluster approa
 ch. Motivated by parsimony we might wish to construct such a network using
  as few reticulations as possible\, or minimizing the maximum number of re
 ticulations used in any "tangled" region of the network (known as the leve
 l of the network). \n\nIn this talk we present a number of new algorithmic
  results\, both positive and negative\, which emphasize the curious mathem
 atical structure of the softwired cluster model. We also describe the rela
 tionship between our results and other recent results in constructing root
 ed phylogenetic networks. We conclude with a number of intruiging open que
 stions. \n\nThis talk will be given by Steven Kelk\, based on forthcoming 
 joint work between Steven Kelk\, Celine Scornavacca and Leo van Iersel.\n\
 n
LOCATION:Seminar Room 1\, Newton Institute
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