On classes defining a homological dimension
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A class $\mathcal F$ of objects of an abelian category $\mathcal A$ is said to define a \emph{homological dimension} if for any object in $\mathcal A$ the length of any $\mathcal F$-resolution is uniquely determined. In the present paper we investigate classes satisfying this property.
to appear in Contribution to Module Theory, de Gruyter 2007
to appear in Contribution to Module Theory, de Gruyter 2007