On powers of the Euler class for flat circle bundles

Sam Nariman

Apparently a lost theorem of Thurston states that the cube of the Euler class $e^3\in H^6(BDif{f}_{\omega }^{\delta }(S^1);\mathbb{Q})$ is zero where $Dif{f}_{\omega }^{\delta }(S^1)$ is the analytic orientation pres…