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Flat circle bundles, pullbacks, and the circle made discrete
2005
International Journal of Mathematics and Mathematical Sciences
We use basic homotopical methods applied to Lie groups made discrete to prove that the real Euler class of a circle bundle vanishes if and only if the bundle is flat.
doi:10.1155/ijmms.2005.3487
fatcat:2k223v7oyngklpap4bt4rhabdi