Seminar
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| Location: | SLMath: Eisenbud Auditorium |
Keywords and Mathematics Subject Classification (MSC)
Primary Mathematics Subject Classification
No Primary AMS MSC
Secondary Mathematics Subject Classification
No Secondary AMS MSC
In the first part I explain the classical construction of quasi-morphisms by Brooks, a connection between quasi-morphisms and stable commutator length of a group element, scl.
In the second part I discuss algebraic conditions for an element to have scl=0, and on the other hand, explain why negative curvature tends to imply scl>0. Combining them I give a precise condition for a mapping class to have scl >0 in terms Nielsen-Thurston classification. This is a joint work with Bestvina and Bromberg.
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