2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/65528We will announce some results on the values of quantum sl_2 invariants of knots and integral homology spheres. Lawrence's universal sl_2 invariant of knots takes values in a fairly small subalgebra of the center of the h-adic version of the quantized enveloping algebra of sl_2. This implies an integrality result on the colored Jones polynomials of a knot. We define an invariant of integral homology spheres with values in a completion of the Laurent polynomial ring of one variable over the integers which specializes at roots of unity to the Witten-Reshetikhin-Turaev invariants. The definition of our invariant provides a new definition of Witten-Reshetikhin-Turaev invariant of integral homology spheres.Published by Geometry and Topology Monographs at http://www.maths.warwick.ac.uk/gt/GTMon4/paper5.abs.htmlGeometric TopologyQuantum Algebra57M27, 17B37text