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A description of the fundamental group in terms of commutators and closure operators

Bibliographic reference Gran, Marino. A description of the fundamental group in terms of commutators and closure operators.91st Peripatetic Seminar on Sheaves and Logic (University of Amsterdam, du 27/11/2010 au 28/11/2010).
Permanent URL http://hdl.handle.net/2078.1/132130