Title: Borel class and Cartan involution,
Abstract: In this note we prove that the Borel class of representations of 3-manifold
groups to PGL(n,C) is preserved under Cartan involution up to sign. For
representations to PGL(3,C) this is implied by a more general result of E.
Falbel and Q. Wang, however our proof appears to be much shorter for that
special case.