2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147045This is a substantial revision of the older version of this paper. The main result of the old version (the equality, up to a factor of 2 of the Beilinson and Borel regulators) is now a conjecture. The main results give equality of Beilinson chern classes and Cheeger-Simons-Chern classes in various situations such as for flat bundles over quasi projective varieties. We also prove the equality (up to a factor of two) of the Borel regulator element and the universal Cheeger-Simons Chern class.45 pages, Plain TeX. This will appear in "The Arithmetic and Geometry of Algebraic Cycles", Proc. of CRM Summer School, Banff, AMS, 2000Algebraic Geometrytext