# Writing units of integral group rings of finite abelian groups as a product of Bass units

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We give a constructive proof of the theorem of Bass and Milnor saying that if $G$ is a finite abelian group then the Bass units of the integral group ring $\Z G$ generate a subgroup of finite index in its units group $\U\Z G$. Our proof provides algorithms to represent some units that contribute to only one simple component of $\Q G$ and generate a subgroup of finite index in $\U\Z G$ as product of Bass units. We also obtain a basis $B$ formed by Bass units of a free abelian subgroup of finite index in $\U\Z G$ and give, for an arbitrary Bass unit $b$, an algorithm to express $b^{\varphi|G|}$ as a product of a trivial unit and powers of at most two units in this basis $B$.

Autor: Eric Jespers; Ángel del Río; Inneke Van Gelder

Fuente: https://archive.org/