Invariants for a class of torsion-free abelian groups
Invariants for a class of torsion-free abelian groups
In this note we present a complete set of quasi-isomorphism invariants for strongly indecomposable abelian groups of the form <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper G equals upper G left-parenthesis upper A 1 comma ellipsis comma upper A Subscript n Baseline right-parenthesis"> <mml:semantics> <mml:mrow> <mml:mi>G</mml:mi> <mml:mo>=</mml:mo> <mml:mi>G</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:mrow class="MJX-TeXAtom-ORD"> …