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On normal subgroups in the fundamental groups of complex surfaces

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abstract

We show that for each aspherical compact complex surface $X$ whose fundamental group $\pi$ fits into a short exact sequence $$ 1\to K \to \pi \to \pi_1(S) \to 1 $$ where $S$ is a compact hyperbolic Riemann surface and the group $K$ is finitely-presentable, there is a complex structure on $S$ and a nonsingular holomorphic fibration $f: X\to S$ which induces the above short exact sequence. In particular, the fundamental groups of compact complex-hyperbolic surfaces cannot fit into the above short exact sequence. As an application we give the first example of a non-coherent uniform lattice in $PU(2,1)$.

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math.GT 1

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2024 1

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UNVERDICTED 1

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Atoroidal surface bundles

math.GT · 2024-05-20 · unverdicted · novelty 8.0

Existence of a type-preserving homomorphism from the figure-eight knot complement fundamental group to the mapping class group of the thrice-punctured torus, yielding first examples of compact atoroidal surface bundles over surfaces.

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  • Atoroidal surface bundles math.GT · 2024-05-20 · unverdicted · none · ref 48 · internal anchor

    Existence of a type-preserving homomorphism from the figure-eight knot complement fundamental group to the mapping class group of the thrice-punctured torus, yielding first examples of compact atoroidal surface bundles over surfaces.