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SUMMARY:Polynomial-time Nielsen--Thurston type recognition - Richard Webb\
 , Cambridge
DTSTART:20161102T160000Z
DTEND:20161102T170000Z
UID:TALK66740@talks.cam.ac.uk
CONTACT:Ivan Smith
DESCRIPTION:A cornerstone of the study of mapping class groups is the Niel
 sen--Thurston classification theorem. I will outline a polynomial-time alg
 orithm that determines the Nielsen--Thurston type and the canonical reduci
 ng curve system of a mapping class. Time permitting\, I shall describe a p
 olynomial-time algorithm to compute the quotient orbifold of a periodic ma
 pping class\, and I shall discuss the conjugacy problem for the mapping cl
 ass group. This is joint work with Mark Bell.
LOCATION:MR13
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