Splitting the concordance group of algebraically slice knots
arXiv:math/0305363 · doi:10.2140/gt.2003.7.641
Abstract
As a corollary of work of Ozsvath and Szabo [math.GT/0301149], it is shown that the classical concordance group of algebraically slice knots has an infinite cyclic summand and in particular is not a divisible group.
Published by Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol7/paper18.abs.html