%0 Journal Article %T On Ideals and Homology in Additive Categories %A Lucian M. Ionescu %J Mathematics %D 1999 %I arXiv %X Ideals are used to define homological functors for additive categories. In abelian categories the ideals corresponding to the usual universal objects are principal, and the construction reduces, in a choice dependent way, to homology groups. Applications are considered: derived categories and functors. %U http://arxiv.org/abs/math/9906039v2