University of Sydney
School of Mathematics and Statistics
St. Petersburg Technological Institute
Direct Decompositions of Torsion - Free Abelian Groups.
Friday 12th November, 12-1pm, Carslaw 375.
It is well-known, that two decompositions into direct sum of
indecomposable summands of an arbitrary torsion - free abelian
group are not isomorphic in general (in the sense of Krull -
Schmidt). The number of summands in a decomposition and their
ranks are determined completely by a new graphical method.