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David Roberts ♦
David Roberts ♦
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  • Beno Eckmann, Poincaré duality groups of dimension 2 are surface groups, In: Combinatorial Group Theory and Topology. (AM-111), 1987, pp. 35-52, JSTOR, Google Books.

Poincar'e duality groups of dimension 2 are surface groups. Also available in: Mathematical Survey Lectures 1943–2004. Springer, Berlin, Heidelberg, 2006. https://doi.org/10.1007/978-3-540-33791-1_9

Poincar'e duality groups of dimension 2 are surface groups.

  • Beno Eckmann, Poincaré duality groups of dimension 2 are surface groups, In: Combinatorial Group Theory and Topology. (AM-111), 1987, pp. 35-52, JSTOR, Google Books.

Also available in: Mathematical Survey Lectures 1943–2004. Springer, Berlin, Heidelberg, 2006. https://doi.org/10.1007/978-3-540-33791-1_9

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Ian Agol
Ian Agol
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Poincar'e duality groups of dimension 2 are surface groups.