2 papers
math.GT2005
Cohomological structure of the mapping class group and beyond
Shigeyuki Morita
In this paper, we briefly review some of the known results concerning the cohomological structures of the mapping class group of surfaces, the outer automorphism group of free grou…
math.SG2004
Characteristic classes of foliated surface bundles with area-preserving holonomy
D. Kotschick, S. Morita
Making use of the extended flux homomorphism on the group of symplectomorphisms of a closed oriented surface of genus at least 2, we introduce new characteristic classes of foliate…