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Duality and invariants of representations of fundamental groups of 3-manifolds into PGL(3,C)

Abstract

We determine the explicit transformation under duality of generic configurations of four flags in \PGL(3,\bC) in cross-ratio coordinates. As an application we prove invariance under duality of an invariant in the Bloch group obtained from decorated triangulations of 3-manifolds.Comment: Revised version, 29 pages,4 figure

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