Complete intersection dimension
Luchezar L\. Avramov, Vesselin N\. Gasharov, and Irena V\. Peeva
Preprint, 1995.
\abstract
A new homological invariant is introduced for a finite module over a commutativenoetherian ring: its CI-dimension. In the local case, sharp quantitative and
structural data are obtained for modules of finite CI-dimension, providing the
first class of modules of (possibly) infinite projective dimension with
a rich structure theory of free resolutions. 
\endabstract