Another proof to Kotschick-Morita's Theorem of Kontsevich homomorphism

Kentaro Mikami

In \cite{KOT:MORITA}, Kotschick and Morita showed that the Gel'fand-Kalinin-Fuks class in $\ds \HGF{7}{2}{}{8}$ is decomposed as a product $\eta \wedge \omega$ of some leaf cohomology class…